Duke, 60 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 15
“The Fifteenth Spirit in Order is Eligos, a Great Duke, and appeareth in the form of a goodly Knight, carrying a Lance, an Ensign, and a Serpent. He discovereth hidden things, and knoweth things to come; and of Wars, and how the Soldiers will or shall meet. He causeth the Love of Lords and Great Persons. He governeth 60 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.