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 54
“The Fifty-fourth Spirit is called Murmur, or Murmus, or Murmux. He is a Great Duke, and an Earl; and appeareth in the Form of a Warrior riding upon a. Gryphon, with a Ducal Crown upon his Head. There do go before him those his Ministers, with great Trumpets sounding. His Office is to teach Philosophy perfectly, and to constrain Souls ” Or Warrior. ~* Thus expressed in the Codices. Deceased to come before the Exorcist to answer those questions which he may wish to put to them, if desired. He was partly of the Order of Thrones, and partly of that of Angels. He now ruleth 30 Legions of...”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.