Duke, 26 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 16
“The Sixteenth Spirit is Zepar. He is a Great Duke, and appeareth in Red Apparel and Armour, like a Soldier. His office is to cause Women to love Men, and to bring them together in love. He also maketh them barren. He governeth 26 Legions of Inferior Spirits, and his Seal is this, which he obeyeth when he seeth it.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.