Any statement about the first Aethyr belongs to one of three layers of the record, and they are roughly three centuries apart. Saying which layer a claim comes from is most of what can honestly be said about an individual Aethyr.
The far end of the sequence
LIL is numbered first of the thirty and is, by the convention of the material, the most remote of them. In Crowley's working order it is therefore the last, reached at the end of the ascent rather than the beginning. Nothing in the Dee and Kelley material describes it beyond its name, its governors and its position; the descriptive content that circulates comes from Crowley's 1909 record.
The diaries, 1580s
The name LIL, its place as the first of the thirty, and the governors assigned to it all come from the scrying sessions of John Dee and Edward Kelley in the 1580s. In that material the thirty Aethyrs divide the earth between ninety-one governors: twenty-nine Aethyrs hold three each and the thirtieth holds four. This atlas carries all ninety-one, and the arithmetic can be checked against them.
Crowley, 1900 and 1909
Almost everything said about the character of an individual Aethyr in modern circulation comes from Aleister Crowley. By his own account he began the series in Mexico in 1900 and completed it with Victor Neuburg in the Algerian desert in late 1909, and the record was published as The Vision and the Voice. Those descriptions are Crowley's visionary record of 1909, not Dee's, and they are not in the sixteenth-century diaries at all.