Duke, 30 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 8
“The Eighth Spirit is Barbatos. He is a Great Duke, and appeareth when the Sun is in Sagittary, with four noble Kings and their companies of great troops. He giveth understanding of the singing of Birds, and of the Voices of other creatures, such as the barking of Dogs. He breaketh the Hidden Treasures open that have been laid by the Enchantments of Magicians. He is of the Order of Virtues, of which some part he retaineth still; and he knoweth all things Past, and to come, and conciliateth Friends and those that be in Power. He ruleth over 30 Legions of Spirits. His Seal of Obedience is...”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.