President, 29 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 31
“The Thirty-first Spirit is Foras. He is a Mighty President, and appeareth in the Form of a Strong Man in Human Shape. He can give the understanding to Men how they may know the Virtues of all Herbs and Precious Stones. He teacheth the Arts of Logic and Ethics in all their parts. If desired he maketh men invisible, and to live long, and to be eloquent. He can discover Treasures and recover things Lost. He ruleth over 29 Legions of Spirits, and his Seal is this, which wear thou, etc.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.