King, 40 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 — gold 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 51
“The Fifty-first Spirit is Balam or Balaam. He is a Terrible, Great, and Powerful King. He appeareth with three Heads: the first is like that of a Bull; the second is like that of a Man; the third is like that of a Ram. He hath the Tail of a Serpent, and Flaming Eyes. He rideth upon a furious Bear, and carrieth a Boshawk upon his Fist. He speaketh with a hoarse Voice, giving True Answers of Things Past, Present, and to Come. He maketh men to go Invisible, and also to be Witty. He governeth 40 Legions of Spirits. 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.