Oportet Mercurium per loca consona, & per configurationes aliarum stellarum in nativitatibus esse fortem ad hoc quod natus habeat dignitatem. Mercurius enim per se planeta debilis est.
"Mercury becomes appropriately strong in nativities by means of congenial places and configurations with other stars, so that the native has dignity. But Mercury in himself is a weak planet." [I follow the reading of the 1494 edition; the 1533 edition reads debeat for habeat, which makes little sense]
So what are Mercury's loca consona (congenial or accordant places)? They are, first of all, Gemini and Virgo, the two signs ruled by Mercury, especially the latter which is also the Exaltation of Mercury. What is more, the signs of Gemini, Libra, and Aquarius are ruled by Mercury by virtue of their being Air Signs--so that Mercury is doubly dignified in both Gemini and Virgo. In addition, Mercury possesses Terms in all twelve of the signs: degrees 13-20 of Aries, degrees 9-14 of Taurus, degrees 1-6 of Gemini, degrees 14-19 of Cancer, degrees 19-24 of Leo, degrees 1-7 of Virgo, 7-14 of Libra, degrees 12-19 of Scorpio, degrees 18-21 of Sagittarius, degrees 1-7 of Capricornus, degrees 1-7 of Aquarius, and degrees 17-19 of Pisces. The terms of Mercury amount to 76 degrees in all. If we consider the Faces as well, we find that Mercury rules five of them: the first facies of Taurus, the second facies of Cancer, the third facies of Virgo, the first facies of Sagittarius, and the second facies of Aquarius.
There are thus 190 degrees altogether in which Mercury is essentially dignified; using the traditional point-system (5 points for Domicile, 4 for Exaltation, 3 for Triplicity, 2 for Term, 1 for Facies; - 5 points for Exilium, - 4 for Depressio; - 5 points for Peregrinatio), these may be laid out as follows:
1-12 Aries [- 5]; 13-20 Aries [+ 2]; 21-30 Aries [- 5]
1-8 Taurus [+ 1]; 9-10 Taurus [+ 3]; 11-14 Taurus [+ 2]; 15-30 Taurus [- 5]
1-6 Gemini [+ 10]; 7-30 Gemini [+ 8]
1-10 Cancer [- 5]; 11-13 Cancer [+ 1]; 14-19 Cancer [+ 3]; 20 Cancer [+ 1]; 21-30 Cancer [- 5]
1-18 Leo [- 5]; 19-24 Leo [+ 2]; 25-30 Leo [- 5]
1-7 Virgo [+ 11]; 8-20 Virgo [+ 9]; 21-30 Virgo [+ 10]
1-6 Libra [+ 3]; 7-14 Libra [+ 5]; 15-30 Libra [+ 3]
1-11 Scorpio [- 5]; 12-19 Scorpio [+ 2]; 20-30 Scorpio [- 5]
1-10 Sagittarius [- 4]; 11-17 Sagittarius [- 10]; 18-21 Sagittarius [- 3]; 22-30 Sagittarius [- 10]
1-7 Capricornus [+ 2]; 8-30 Capricornus [- 5]
1-7 Aquarius [+ 5]; 8-10 Aquarius [+ 3]; 11-20 Aquarius [+ 4]; 21-30 Aquarius [+ 3]
1-16 Pisces [- 14]; 17-19 Pisces [- 7]; 20-30 Pisces [- 14]
Peregrinatio is the condition of a planet when it possesses no essential dignities; the regions of the Zodiac in which Mercury is Peregrine are indicated above in red; consequently, in those cases (as in Sagittarius and Pisces) where Mercury is debilitated by Exilium or Depressio, there are some instances where two, or even three, deductions must be made. An analysis of these values reveals that there are 173 degrees where Mercury is essentially dignified and has a positive number of points; 17 degrees where Mercury is essentially dignified but has a negative number of points; and 170 degrees where Mercury is peregrine (always with a negative point-value). Mercury's passage through some of the signs (e.g. Cancer) involves a complex topography, while other signs (e.g. Gemini) are quite simple.
Beltrano has always emphasized the importance of becoming thoroughly acquainted with the topography of the zodiacal circle. The zodiac contains numerous subdivisions like those just mentioned, and these regions display a wide variety of features, tendencies, and characteristics. The Zodiac is like a map, a city, a kingdom, a variegated landscape of great complexity. Only by acquiring a thorough familiarity with the regions of the zodiac does it become possible to understand and delineate the effects of the planets posited within them.
Fortunately, there have come down to us numerous descriptions of these regions and subdivisions. These are part of what Beltrano has designated as the Narrative Mode of Horoscopic Interpretation. By this he means that "the details of the horoscope are allowed to generate a kind of story. Here, the planets are personified as men and women interacting in various ways (friendly or unfriendly). These interactions and conflicts work themselves out in a complex and colorful environment which arises organically from the traditional descriptions of the signs of the zodiac and their subdivisions" (Beltrano, "Narrative Mode," 2009).
Let us first consider what has been said of Mercury in Gemini and Virgo, Libra and Aquarius, the four signs which it rules:
GEMINI: In omnibus partibus Geminorum concupiscit litigationes, & parat se ad interficiendum homines, invitat ad res celatas & coopertas ("In all parts of Gemini [Mercury] is fond of litigation, and makes plans to slaughter people, [and] entices [them] toward hidden, secret matters") [Haly Abenragel, De Iudiciis Astrorum I.iv)]. "When Mercury is in Gemini or Virgo, it imports the Native to be vertuous, well disposed and faithful: he shall attain perfection in all Sciences, as well in the practique as speculative part: he shall be also skilful in mechanical Professions" (Jno. Gadbury, Genethlialogia, 1658, ch. IX, sec. 6). Mercury is essentially dignified in Gemini, with a score of 8 to 10 points.
VIRGO: In omnibus partibus Virginis valens est missor balistem, arma tenet, bestias, equos, milites homines ac pedites, & bona munimenta ("In all parts of Virgo [Mercury] is a mighty hurler of missiles, [and] has weapons, beasts, horses, solders and infantrymen, and good supplies") [Haly Abenragel, loc. cit.]; Gadbury's description of Mercury in Gemini applies to Mercury in Virgo as well. Mercury is essentially dignified in Virgo, with a score of 9 to 11 points.
LIBRA: In omnibus partibus Librae servat libros, & est lector, computator, & immiscit se scientijs ("In all parts of Libra [Mercury] collects books, and is a reader, calculator, and involves himself in the sciences") [Haly Abenragel, loc. cit.]. "If Mercury be in Taurus or Libra, in any Nativity, it signifies the Native cheerful and pleasant; and that he shall attain the knowledge of all Arts, and all o[ther] things whereby Men may be delighted, or shall take pleasure in" (Gadbury, loc. cit.). Mercury is essentially dignified in Libra, with a score of 3 to 5 points.
AQUARIUS: In omnibus partibus Aquarij est astrologus, augur, geomanticus, immittit se ad exponendum somnia & divinationes ("In all parts of Aquarius [Mercury] is an astrologer, an augur, a geomancer; he concerns himself with interpreting dreams and divinations") [Haly Abenragel, loc. cit.]. "And if Mercury be in Capricornus or Aquarius, in either a Diurnal or Nocturnal Birth, it imports the Native to be full of suspicion, and evil-tongued; yet shall he joyn himself willingly to religious and wise Men" (Gadbury, loc. cit.). Mercury is essentially dignified in Aquarius, with a score of 3 to 5 points.
Let us also consider how Mercury is characterized in Sagittarius and Pisces, the signs in which it is debilitated:
SAGITTARIUS: In omnibus partibus Sagittarij est interfector, tenet armorum munimenta, & praeparatus est ad litigandum ("In all parts of Sagittarius [Mercury] is a killer; he has military equipment and is ready for litigation") [Haly Abenragel, loc. cit.]. "When Mercury in a Diurnal Nativity, shall be in Sagittarius or Pisces, and well fortified, it shews the Native shall abide with Kings, and shall have the disposing or manging [sic] of their Affairs: he shall be prudent in Judgement. But if the Birth be by Night, it portends the same, though not in so great a measure" (Gadbury, loc. cit.). Mercury is debilitated in Sagittarius, with a score of -4 to -10 points.
PISCES: In omnibus partibus Piscium est pulcher, acutus, intelligens, ornatam formam formosarum vestium, corpore completus & membris, honestus, honoratus & fortis ("In all parts of Pisces [Mercury] is beautiful, keen-sighted, intelligent, dressed in gorgeous clothes, perfect in body and members, virtuous, distinguished and brave") [Haly Abenragel, loc. cit.]. Gadbury's description of Mercury in Sagittarius applies to Mercury in Pisces as well. It is very interesting that, although Haly describes this position in very positive terms, Mercury is profoundly debilitated in Pisces, with a score of -7 to -14 points.
Here are Vettius Valens' descriptions of the Twelve Terms of Mercury (Anthologiae I.3):
Aries 13-20: ambiguous, mutable and clever, motionless, productive of wind, hale, thunder, and lightning.
Taurus 9-14: intelligent, prudent, mischievous, having little seed, sinister, lethal.
Gemini 1-6: temperate, mild, intelligent, skilled in many arts, knowledgeable, effective, glorious, abounding in seed.
Cancer 14-19: exacting, rapacious, leading in public affairs, tax-farming, vulgar, resourceful, amassing wealth.
Leo 19-24: esoteric, popular, professorial, creative, conventional, intelligent; but they are without seed, like aged men.
Virgo 1-7: most lofty, controlling, competent, very wise, suitable, arranging great matters, most intelligent and in every way well-bred and eminent, but not fortunate in romance—this is generally the case with all of Virgo, but especially these degrees and those of Venus; for these degrees are open to accusation, while those of Venus fall short in everything; but they are eminent in matters of education.
Libra 7-11: gregarious, handy, mercantile, versed in letters and able to combine numbers, on the whole civilized, intelligent.
Scorpio 12-19: military, contentious, of those bearing wreathes and those sharp of speech, contentious, not to be despised; and these are fertile, and generally of those with mischievous intent, especially concerning those who attempt or accomplish wicked deeds.
Sagittarius 18-21: of those who are talkative, extremely clever, prudent, establishing monuments, philosophic, generally preeminent with respect to knowledge and good judgment, of those fond of learning when Mercury is approaching, but when Mars is approaching, of tacticians.
Capricorn 1-7: theatrical, satirical, imitative, mendacious, proper to harlots, seductive, desirous of what belongs to others, and disreputable, but dull in all things and agreeable and resourceful, but not proud.
Aquarius 1-7: of the wealthy, those fond of accumulating wealth, pleasantly hoarding things up according to the measure of their birth, intelligent, conventional, giving a systematic account of everything, commanding, mean-spirited, full of care, lovers of education and every kind of skill, controlling, economical, benevolent.
Pisces 17-19: abounding in seed, dominant honored, having many friends, bounteous, nurturing, merciful, pious, temperate.
You can clearly see from these descriptions that it is a great mistake to make any generic assumptions about the "terms of Mercury," as each of the planet's twelve terms is of quite a different character, sometimes with tendencies in marked contrast. These are of course the "Egyptian Terms," the scheme most commonly used; other schemes of Planetary Terms include the Chaldaean Terms, the Ptolemaic Terms (which Ptolemy claims to have discovered antigrapho palaio kai ta polla diephtharmeno ["in an ancient manuscript, much damaged"], the terms of Vettius Valens (a scheme incorporating the Luminaries), and the terms of Cardanus, among others.

Now let us turn our attention to the five Decans ruled by Mercury. According to Teucer of Babylon (CCAG VII.198-211), the first decan of Taurus is associated with "those conversant with danger, extravagant, childless, with few siblings." Teucer also notes that this decan contains the Gorgon's Head, with the extremely malevolent fixed star Algol; however, as a result of Precession, Algol has now shifted to the third decan of Taurus. Cornelius Agrippa (De Occulta Philosophia, II.37) describes the same decan as vir nudus et spiculator sive arator, et proficit ad seminandum, arandum, aedificandum, populandum, dividendum terras, et ad artes geometriae ("a naked man, a harvester or plowman, and he goes forth to sow, plough, build, people and divide the earth, according to the rules of geometry"). The name of this decan is Suo.
According to Teucer, the second decan of Cancer is associated with those who are "petty, sickly, able to attain their ends, living abroad, misled by appearances, skillful. Agrippa has vir decoris indutus vestibus, sive vir et mulier ad mensem sedentes et ludentes. Confert divitias, hilaritatem, laetitiam et amores mulierum ("a man clothed in fine raiment, or a man and woman sitting at a table and playing a game; it bestows riches, mirth, gladness, and loves of women"). The name of this decan is Sith.
As for the third decan of Virgo, Teucer associates it with "those of reduced circumstances, assuming a subordinate position and undeservedly submitting to many indignities"); Agrippa has mulier alba et surda, sive homo senex innixus baculo, et significatio ejus est ad debilitatem et infirmitatem et damnamentum membrorum, et ad destructionem arborum, et depopulationem terrarum ("a woman white-haired and deaf; or an old man leaning on a staff; and the signification of this is of weakness and infirmity and the loss of members, and of the destruction of trees and the depopulation of lands"). The name of this decan is Afut.
Teucer's first decan of Sagittarius is associated with "destroyers of houses and gluttons and the negligent; hard-working, residing abroad or even dying abroad", while Agrippa describes it as forma viri armati lorica, gladium nudum in manu tenentis, et operatio eius ad audaciam, militiam et libertatem ("the form of a man armed with a cuirass, holding a naked sword in his hand; and his operation is for boldness, warfare, and liberty"). The name of this decan is Eregbuo.
Finally, according to Teucer, the second decan of Aquarius is associated with "those who are cheery, dancers, guileless, those troubled by moisture, happy, flourishing, enjoying good repute with those in authority and with soldiers." Agrippa's description of the same is forma viri cum prolixa barba et significatio eius est intellectus mansuetudinis, modestiae, libertatis et bonorum morum ("the form of a man with a long beard; and his signification is of understanding, meekness, modesty, liberty and good manners"). The name of this decan is Cratero.
Finally, there is the matter of planets posited in the terms of other planets, and there is much lore associated with this as well.
If we examine our Inception Chart, we find that Mercury is posited in the last (30th) degree of Virgo, falling within the termini of Saturn. Mercury is very powerful in this position, with Essential Dignities amounting to 10 points (5 points for being in its own Domicile, 4 points for being in its own Exaltation, and 1 point for being in its own Facies). Based on the texts we have just been studying, the following descriptions apply:
1. [Mercury in Virgo]: "In all parts of Virgo [Mercury] is a mighty hurler of missiles, [and] has weapons, beasts, horses, solders and infantrymen, and good supplies" (Haly). "When Mercury is in Gemini or Virgo, it imports the Native to be vertuous, well disposed and faithful: he shall attain perfection in all Sciences, as well in the practique as speculative part: he shall be also skilful in mechanical Professions" (Gadbury).
2. [The third face of Virgo]: "Those of reduced circumstances, assuming a subordinate position and undeservedly submitting to many indignities" (Teucer). "A woman white-haired and deaf; or an old man leaning on a staff; and the signification of this is of weakness and infirmity and the loss of members, and of the destruction of trees and the depopulation of lands" (Agrippa).
3. [Mercury in the term of Saturn]: In our Inception Chart, Mercury is posited in the term of Saturn in Virgo, a place which Valens describes as "portentous, very cold, destructive, short-lived, of deluded men" (Anthologiae I.3). According to Junctinus (Speculum Astrologiae, 1583, I.876), Mercurius si fuerit in termino Saturni, faciet infelices, amaros, tacitos, & qui verborum ordinem cum quadam semper sermonis moderatione suspendant, ac secreta fideli taciturnitate contineant: sed in omnibus tarde proficientes, laborantes tamen fortiter, & qui populo malam famam semper insinuent. Erunt praeterea venenati, & quorum malitia ad omne veneni virus accedat, iras suas perpetuis indignationibus perseverantes, quandiu fuerint, aut casu, aut suo merito vindicati: vigilantes quoque, sufficientes, ac omni moderatione necessarij, & qui omnia quae futura sunt, obire consueverint ita, ut illis & status futuri & praesentes per somnia manifestis revolutionibus intimentur, qui tamen consiliis suis ad omnem impetum temeritatis accedant ("If Mercury is in the term of Saturn, he will produce those who are unhappy, bitter, silent, those who always break off in mid-sentence owing to a certain economy with words, and keep secrets with a dependable silence: but advancing slowly in everything although they work hard; and those about whom they always insinuate evil rumors in public. Moreover, these people are poisonous, and their malice is added to every [sort of] venom, as they pursue their rage with continuing resentment, until they are avenged either by chance or by desert: they are also vigilant, self-sufficient, practicing all moderation, and they are accustomed to facing all eventualities, so that both future and present situations are made known to them through dreams [in accordance] with the visible [planetary] revolutions; nevertheless they add their counsels to every rash impulse"). Junctinus supplements the foregoing description, drawn from Firmicus Maternus, with another one derived from Messahala: Mercurius si fuerit in termino Saturni inventus, natus erit laetus pro virtute sua, & eveniet inter ipsum & fratres ejus inimicitia, & videbit mortem fratrum suorum, & transibunt multi dies, & impraegnabitur uxor eius, & minoris fortunae erit pro mulieribus, & stabit multos dies in peregrinatione, & fiet dives, & postea inveniet damnum & propinquus cum eo scandalum habebit, & ibunt in querimonia ad principem, sed manus eius erit fortior manibus eorum, & erit infirmus in partibus occultis, & transibit annos in gaudio & bonitate. Et quandocunque intraverit Mercurius in terminum Saturni, vult mundificari ("If Mercury is found in the term of Saturn, the native will be happy in proportion to his virtue, and there will arise enmity between him and his brothers, and he will see the death of his brothers, and many days will pass, and his wife will become pregnant, and [he] will have little luck with women, and he will spend many days wandering, and will become rich, and eventually he will suffer loss and [his] kinsman will be involved in a scandal with him, and they will bring a case before the prince, but he will prevail over his adversaries, and he will be afflicted in his private parts, and will pass [his] years in joy and integrity. And whenever Mercury enters the term of Saturn, he wants to be purified").
4. [The term of Saturn in Virgo]: "portentous, very cold, destructive, short-lived, of deluded men" (Valens).
So much, then, for the loca consona of Mercury; we have barely scratched the surface--much more could be said about this if we were to consult additional sources, but what we have presented will give a good idea of how these matters are to be understood. It should be evident from this that we possess a wealth of material from antiquity featuring precise delineations of the significance of specific planetary positions and configurations. The astrologer's task is simply to identify the relevant features of the chart and then to locate and cite the passages in the astrological literature which apply to the situation. There is no need to create such delineations from scratch, as is the custom of most modern astrologers. Confronted with a situation where (for example) Venus and Mars are found to be in diametrical opposition, these charlatans will typically profer such garbage as "you are experiencing a conflict between your Masculine and Feminine Principles; keep this in mind and try to use it to your advantage."
As to Mercury's configurationes aliarum stellarum ("configurations with other stars"), this means nothing more nor less than the Aspects between Mercury and the other six planets. We will consider the interplanetary aspects and testimonies as narrowly defined by our Hellenistic sources. Examining our Inception Chart, we find the following aspects involving Mercury:
1. Mercury sextile Venus (defluxio: Mercury is separating from an aspect to Venus).
2. Mercury conjunct Sun (attestatio, but will not perfect before Mercury crosses into Libra).
3. Mercury square Mars (partile).
Of these, the second cannot be considered because it will never perfect. The sextile between Mercury and Venus is a harmonious and favorable relation between the two planets, but is greatly weakened because the planets are not applying, but separating. Such a relation is often associated with that which is past, but still pertinent. The square between Mercury and Mars is extremely powerful (because both planets are in the 30th degree of their signs) and extremely negative (not only is it a "hard aspect," but it involves a malefic planet). Clearly this partile square to Mars overrides any remaining benefits conferred by the separating sextile to Venus, so that the influence of Mercury is greatly weakened in this chart. Intellectual activity is stymied by conflict and aggression.
Mercury is indeed a "weak planet"--neither benefic nor malefic, neither masculine nor feminine, neither diurnal nor nocturnal, complex in its motions and seldom seen, changing and assuming the characteristics of other planets in rapid succession. In our Inception Chart, we find Mercury strongly placed, yet badly aspected. This is a situation where advantages and disadvantages cancel each other out, leaving Mercury as a dim, complex, and mysterious influence, conferring but little dignity on Beltrano's Parlour!
OTTAVIO BELTRANO, vates & astrologus