ZIM is the thirteenth of the thirty Aethyrs, or Airs, of the Enochian system, the thirty spiritual regions delivered to the mathematician John Dee and the scryer Edward Kelley in 1584, and named in the record Dee compiled from those sessions. Its three-letter name, ZIM, was received letter by letter through Kelley's scrying.
Place in the system
Each Aethyr is said to contain three Governors among whom the ninety-one Parts of the Earth are divided.
The thirty Aethyrs are the raw gift of the Dee-Kelley sessions; the elaborate visionary content attached to them in modern practice belongs to a later layer, above all Aleister Crowley's The Vision and the Voice, his record of scrying all thirty Aethyrs in 1900 and 1909. The Aethyr is described here as an element of that documented historical tradition, studied as such, its entities not reified.
The three Governors
ZIM's Parts are Gecaond, ruling Achaia, the northern Peloponnese, under King Lavavot of the tribe of Gad; Laparin, ruling Armenia under King Olpaged of the tribe of Dan; and Docepax, ruling a Part called Nemrodiana, evidently formed from Nimrod, the biblical builder of Babel, under King Alpudus of the tribe of Issachar. Dee worked the sessions behind this material in 1584, largely at Cracow and Prague, and compiled them into Liber Scientiae the following year; the manuscript is dated 2 May 1585, and the sessions themselves had closed on 13 July 1584 with the delivery of the Call of the Aethyrs and the Aethyr names.