niṣirtu

Definition

Niṣirtu (Akkadian, from the root nṣr "to guard, protect"; literally "a guarded, hidden treasure" and hence "secret knowledge") is the colophon-vocabulary term Late Babylonian scribes used to designate a tablet's content as restricted scholarly material. The standalone feminine noun is the philological root of the compound place-names bīt niṣirti and ašar niṣirti, but its own primary register is the secrecy-discipline of cuneiform scholarship — the protected core of an ummânu's professional knowledge.

In Tradition

Assyriological scholarship treats niṣirtu as the canonical Akkadian secrecy-marker of the Late Babylonian scholastic tradition. Rochberg pairs it with piriştu as the standard colophon secrecy-vocabulary, citing the related phrase niṣirti ummâni ("secret of the scholar") as the marker for the protected core of a scholar's knowledge. Brown draws on the same convention in ACT 135 and BM 29731, where niṣirtu certifies a text as belonging to the EAE-derived "wisdom" tradition.

In Practice

For the student of how Babylonian celestial knowledge was transmitted and certified, niṣirtu names the convention by which a tablet's content was bracketed off as "guarded" material — accessible only to scribes already inside the scholarly community. Rochberg's clearest attestation is a Lunar Six astronomical text possibly dating to the fifth century BCE that designates itself "tablet of the secrets of heaven, the exclusive things of the great gods" and proscribes communication to anyone outside Babylon or Borsippa. Another text instructs the scribe to preserve the secret knowledge of āšipūtu so that no one else may see it. Brown finds the same convention in late procedure-text colophons: ACT 135 closes with "Arû, the wisdom of Anu-ship … a secret of the scholar," and the periodic-error parameters of "text E" are flagged as mí.urì niṣirtu, "secret." The convention positioned a text inside the scribal guild's professional boundary and legitimated its content as Enūma-Anu-Enlil-derived wisdom rather than novelty.

Historical Origin

Niṣirtu is attested across Late Babylonian astronomical and divinatory colophons, with Rochberg dating the Lunar Six "tablet of the secrets of heaven" to possibly the fifth century BCE; Brown's ACT 135 and BM 29731 attestations are Late Babylonian / Hellenistic procedure-text colophons. Modern critical treatments: Rochberg, *The Heavenly Writing* (2004), Ch. 6 §6.1 pp. 212-213; Brown, *Mesopotamian Planetary Astronomy-Astrology* (2000), pp. 236-237.

Further Reading

• Francesca Rochberg, The Heavenly Writing: Divination, Horoscopy, and Astronomy in Mesopotamian Culture
• David Brown, Mesopotamian Planetary Astronomy-Astrology