Any statement about the second 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 diaries, 1580s
The name ARN, its place as the second 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.
Counting the thirty
The Aethyrs are numbered with LIL as the first and TEX as the thirtieth, and the convention is that the first is the most remote and the thirtieth the nearest. Crowley accordingly worked them in reverse, beginning at the thirtieth and ascending, which is why the numbering in his record runs down the page as the sequence goes up. A reader meeting a list that starts at TEX is looking at working order, not at a different numbering.
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.