Duke, 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 — copper 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 42
“The Forty-second Spirit is Vepar, or Vephar. He is a Duke Great and Strong and appeareth like a Mermaid. His office is to govern the Waters, and to guide Ships laden with Arms, Armour, and Ammunition, etc., thereon. And at the request of the Exorcist he can cause the seas to be right stormy and to appear full of ships. Also he maketh men to die in Three Days by Putrefying Wounds or Sores, and causing Worms to breed in them. He governeth 29 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.