Marquis, 20 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 — silver 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 37
“The Thirty-Seventh Spirit is Phenex (or Pheynix). He is a great Marquis, and appeareth like the Bird Phoenix, having the Voice of a Child. He singeth many sweet notes before the Exorcist, which he must not regard, but by-and-by he must bid him put on Human Shape. Then he will speak marvellously of all wonderful Sciences if required. He is a Poet, good and excellent. And he will be willing to perform thy requests. He hath hopes also to return to the Seventh Throne after 1,200 years more, as he said unto Solomon. He governeth 20 Legions of Spirits. And his Seal is this, which wear thou, etc.”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.