Leo
Leo occupies the fifth thirty-degree arc of the tropical zodiac, from 120 to 150 degrees of ecliptic longitude, measured from the March equinox. In the constellation of the same name lies Regulus, one of four stars bright enough and close enough to the ecliptic to be regularly approached and occasionally occulted by the Moon; the other three are Aldebaran in Taurus, Spica in Virgo and Antares in Scorpius. Regulus’s Latin name, “little king”, carries an older royal reading forward: the Babylonians called the same star Sharru, “the king” 1. Rogers, an astronomer synthesising Assyriological scholarship, also records that the Lion marked the summer solstice for the Sumerians 1.
Names, and what the earliest one says
The Babylonian constellation is UR.GU.LA, “the Lion” 2. The Greek name is Leon, “lion”, and the Latin Leo follows it directly. Nothing was reassigned in the crossing to Greek: the figure this site’s domain tables carry forward is a lion in the Babylonian compendium and a lion in the Greek zodiac, with no reinterpretation and no competing mythological overlay displacing the animal itself.
That continuity is itself the point of interest. Virgo’s furrow was reread as a maiden, and Aries’s hired agricultural labourer was reread as a ram Virgo; Leo did neither. A straight transmission is what most of the twelve signs seem to have done, on the evidence gathered for this site, and the reassignments stand out only because they depart from a background of cases like this one.
The Babylonian name itself, however, is less settled than a single gloss of “the Lion” suggests.
Contested
At issueDoes UR.GU.LA, the Babylonian name behind Leo, mean 'the Lion' or 'the Great Dog'?
Rogers gives both readings in the same paper, without adjudicating between them. Discussing the boundary stones, he raises the possibility that one shows Leo by the dog of the goddess Gula, on the ground that “the name UR.GU.LA for Leo means ‘Great Dog’”, while noting that the dog was represented in the constellation now called Hercules 1. Elsewhere, his own star table glosses UR.GU.LA plainly as “The Lion, Latarak”, naming a lion-headed protector god 1. The split has a linguistic basis: Sumerian UR covers both dog and lion, so a single compound name can be glossed either way depending on which sense a reader takes as primary. This entry reports both readings and does not choose between them.
Rogers also offers a candidate origin behind the animal itself, hedged as his own suggestion: Ishtar “may have been the origin” of three constellations at once, the Bow, behind the modern Canis Major, Leo, and Virgo 1. The suggestion connects to a point made at Virgo: the early Mesopotamian pictographs behind that sign show Ishtar herself, with lions and holding vegetable produce, before the figure there came to be identified with the goddess Shala. If Rogers’s suggestion holds, the same goddess sits somewhere behind both Leo’s lion and Virgo’s produce-bearing figure, but no source consulted here states either identification as settled.
Leo’s iconography also places it against a third figure. The Lion is shown standing on the serpent Hydra on a boundary stone, and again in both the Seleucid and Dendera zodiacs 1, a pairing that recurs from Mesopotamian boundary-stone art through to Ptolemaic Egypt.
Technical attributions
| Domicile | Sun |
|---|---|
| Detriment | Saturn |
| Exaltation | none |
| Fall | none |
| Triplicity | Fire. By day Sun, by night Jupiter, participating Saturn |
| Bounds (Egyptian) | Jupiter 0-6Venus 6-11Saturn 11-18Mercury 18-24Mars 24-30 |
| Faces | Saturn 0-10, Jupiter 10-20, Mars 20-30 |
Leo is the Sun’s only domicile: no other sign is assigned to it. It is also the one sign in which the domicile lord and the daytime triplicity lord are the same body. The Sun rules fire’s triplicity by day in every fire sign 3 bk. I, but only in Leo does that coincide with the domicile itself; in Aries the domicile lord is Mars and in Sagittarius it is Jupiter. The pairing echoes, in a milder form, the anomaly Virgo notes for Mercury, which both rules and is exalted in the same sign: exaltation and triplicity are different offices, so Leo’s case is a coincidence of two lesser dignities, but it is the same kind of overlap. Leo carries no exaltation and no fall anywhere in the sevenfold scheme: no planet is said to be exalted here, and none is said to fall here either Essential Dignity. Leo’s opposite is Aquarius, the sign of its detriment, assigned to Saturn in the traditional scheme Aquarius. Leo’s own domicile has never been part of the modern outer-planet reassignment that put Aquarius under debate between Saturn and a newly discovered planet: only the Sun has ever held Leo, in every system this site tracks, traditional or modern.
Contested
At issueDoes the first bound of Leo belong to Jupiter or to Saturn?
The Greek line gives Jupiter, and the standard English translation prints Jupiter as the first term of Leo 4 bk. I ch. 20. It is also reported that the oldest surviving manuscript of the Paraphrase carries Jupiter and Saturn together, with Jupiter primary; that report is not confirmed from any source this site holds and is given as reported. The Arabic transmission line instead moves Jupiter to the sign’s fifth bound and gives the first to Saturn, which places a malefic first, against the rule Ptolemy states elsewhere that malefics belong at a sign’s end 5. Both lines are attested; neither has been shown to be the original.
Leo and Cancer, the hinge
Leo and Cancer are the two halves of one construction. The Sun takes Leo Sun and the Moon takes Cancer Cancer, and the five remaining planets are assigned outward from that pair, one sign at a time, in order of increasing distance from the Sun 4 bk. I ch. 17. Cancer states the same symmetry from the other end. The IAU constellation Leo spans nearly thirty-six degrees of ecliptic longitude, wider than the tropical sign and nearly twice the width of the narrow constellation Cancer it borders Three Reference Frames. For how a modern character profile for Leo relates to this deeper history, see The Sun-Sign Column.
Gap in the evidence
The two glosses of UR.GU.LA, Lion and Great Dog, are not resolved even within Rogers’s own paper, and no source consulted here says which sense the Babylonians themselves took as primary at any given period. Ishtar’s candidate role behind Leo, Canis Major and Virgo alike is Rogers’s own suggestion and is not established as fact. Whether the Lion’s pairing with Hydra on the boundary stone and in the later zodiacs reflects a stable, named relationship between the two figures, or a recurring visual composition without a settled meaning behind it, is likewise not stated by any source consulted here.
References
- Hermann Hunger, John Steele. The Babylonian Astronomical Compendium MUL.APIN. Scientific Writings from the Ancient and Medieval World. London: Routledge, 2019. find a copy (catalogue search) recordpeer reviewed
The current standard edition. Some listings show 2018 for the first printing. Use this and Rochberg 2004 for Babylonian star names and figures, not the popular compilations that circulate on astrology sites.
- Claudius Ptolemy, trans. F. E. Robbins. Tetrabiblos. Loeb Classical Library 435. Cambridge, MA: Harvard University Press, 1940 (composed c. 150 CE). bk. I ch. 17. find a copy (catalogue search) recordprimary source
The standard English reference and the chapter-numbering scheme this site adopts and names. Non-Robbins reprints number the chapters differently, so every locus here is given as Robbins numbering.
- Dorotheus of Sidon, trans. Benjamin N. Dykes. Carmen Astrologicum: The ʿUmar al-Tabarī Translation: Cazimi Press, 2019 (composed c. 75 CE). bk. I. ISBN 9781934586501 recordprimary source
Second updated edition. A practitioner translation, cited alongside rather than instead of Pingree's 1976 Teubner critical edition. The Greek original is lost; the text survives through a Middle Persian intermediary into Arabic, which is itself part of why the Dorothean material needs careful reading.
- Claudius Ptolemy, Wolfgang Hübner (ed.). Claudii Ptolemaei opera quae exstant omnia, vol. III.1: Apotelesmatika. Stuttgart and Leipzig: Teubner, 1998 (composed c. 150 CE). find a copy (catalogue search) recordscholarly
The critical edition of the Greek text, with the apparatus of variant readings.
- Nicholas Campion. A History of Western Astrology, Volume I: The Ancient and Classical Worlds: Continuum, 2009. ISBN 9781441127372 recordscholarly
The standard single narrative survey. Volume I first appeared as The Dawn of Astrology, Hambledon Continuum, 2008. The subtitle is "The Ancient and Classical Worlds", not "The Ancient World"; the shortened form is widely miscited.
- John H. Rogers. Origins of the ancient constellations: I. The Mesopotamian traditions. Journal of the British Astronomical Association 108(1), 1998, 9-28. https://articles.adsabs.harvard.edu/pdf/1998JBAA..108....9R record Accessed 2026-07-30.scholarly
The reference for the Mesopotamian iconography. It traces every zodiacal figure from the early pictograph seals through the boundary stones to MUL.APIN and the Greek sky-map, and it covers precisely the material an edition of MUL.APIN does not: which deity a figure represented, how it was pictured, and on which dated object. Read in full from the scan linked above before it was cited here. Characterise it when citing, as this site does with Brennan. Rogers is an astronomer synthesising Assyriological scholarship for astronomers, not an Assyriologist: his own sources are Hunger and Pingree's MUL.APIN edition, Gössmann's Planetarium Babylonicum, van der Waerden, and Black and Green. The paper is refereed, heavily cited, and explicit that it is offering inferences in places, which it marks with "I suggest" and "perhaps". Those marks are the author's own and should survive into any entry that uses the passage. A companion Paper II covers the Mediterranean and Greek traditions and is not held here.