Duke, 48 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 49
“The Forty-ninth Spirit is Crocell, or Crokel. He appeareth in the Form of an Angel. He is a Duke Great and Strong, speaking something Mystically of Hidden Things. He teacheth the Art of Geometry and the Liberal Sciences. He, at the Command of the Exorcist, will produce Great Noises like the Rushings of many Waters, although there be none. He warmeth Waters, and discovereth Baths. He was of the Order of Potestates, or Powers, before his fall, as he declared unto the King Solomon. He governeth 48 Legions of Spirits. His Seal is this, the which wear thou as aforesaid.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.