|Languages||Derived from Hebrew|
|Creator||Heinrich Cornelius Agrippa|
|Time period||16th Century|
|Sister systems||Celestial, Malachim|
Transitus Fluvii ("passing through the river" in Latin), or Passage Du Fleuve (in French), is an occult alphabet consisting of 22 characters described by Heinrich Cornelius Agrippa in his Third Book of Occult Philosophy (Cologne, 1533, but written around 1510). It is derived from the Hebrew alphabet, and is similar to the Celestial and Malachim alphabets. The name may refer to the crossing of the Euphrates by the Jews on their return from Babylon to rebuild the Temple.
This alphabet can also be found in Abraham de Balmis Peculium Abrae. Grammatica hebraea una cum latino, Venetiis, 1523, sig. B6v. Also in Geoffroy Tory, Champ Fleury, Paris 1529, f. 76v ubi tamen: “Lettres Chaldaiques,” and Giovanni Agostino Panteo's Voarchadumia contra alchimiam, Venice, 1530, pp. 545–46. Pantheus claims that, while the Hebrew alphabet was entrusted to Moses and Enochian to Enoch, the Transitus Fluvii was entrusted to Abraham.
Appearances in popular culture
The alphabet is depicted in the movie The Blair Witch Project. It is also referenced in the book, "An Enemy at Green Knowe", part of the Green Knowe series by the British author Lucy Boston.
- Gettings, Fred. "Dictionary of Occult, Hermetic and Alchemical Sigils." London ; Boston : Routledge & Kegan Paul, 1981. | ISBN 0-7100-0095-2
- Haywood, H. L.; Mackey, Albert Gallatin. "Encyclopedia of Freemasonry Part 1 (1909)." Kessinger Publishing, 2003 | ISBN 0-7661-4719-3
- V. Perrone Compagni, Cornelius Agrippa De occulta philosophia Libri tres, Leiden: E.J. Brill, 1992, p. 491. | ISBN 978-90-04-09421-5.
- Joannes Pantheus, "Voarchadumia contra alchimiam, ars distincta ab archimia et sophia, cum additionibus, proportinonibus numeris et figuris opportuni." n.d.  Gallica – Bibliothèque nationale de France. 1550.
- Heinrich Cornelius Agrippa's "De Occulta Philosophia" at Wikisource
- Pantheus Voarchadumia contra alchimiam at Gallica
- Passing the River alphabet at Omniglot
- Agrippa, Occult Philosophy Book 3 at esotericarchives
- Peculium Abrae at esotericarchives
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