President, 36 legions
Rank and legion count as the 1904 edition gives them. The legions come from the phrase that closes almost every entry; the rank comes from the book's own appendix, which classifies all seventy-two and states the metal each rank's seal is to be made in — mercury for this one. The entries use rank words descriptively as well — Eligos appears 'in the form of a goodly Knight' and Barbatos comes 'with four noble Kings' — so a rank harvested from the prose would invent titles the book does not give. Only the appendix classifies.
Sources (1)
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Lemegeton
, The Goetia: The Lesser Key of Solomon the King
— The Goetia, spirit 58
“The Fifty-eighth Spirit is Amy, or Avnas. He is a Great President, and appeareth at first in the Form of a Flaming Fire; but after a while he putteth on the Shape of a * Should be 30. For these 72 Great Spirits of the Book are all Princes and Leaders of numbers. Man. His office is to make one Wonderful Knowing” in Astrology and all the Liberal Sciences. He giveth Good Familiars, and can bewray Treasure that is kept by Spirits. He governeth 36 Legions of Spirits, and his Seal is this, etc.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.