King, 22 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 — gold 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 20
“The Twentieth Spirit is Purson, a Great King. His appearance is comely, like a Man with a Lion’s face, carrying a cruel Viper in his hand, and riding upon a Bear. Going before him are many Trumpets sounding. He knoweth all things hidden, and can discover Treasure, and tell all things Past, Present, and to Come. He can take a Body either Human or Aérial, and answereth truly of all Earthly things both Secret and Divine, and of the Creation of the World. He bringeth forth good Familiars, and under his Government there be 22 Legions of Spirits, partly of the Order of Virtues and partly of the...”
Verbatim, cut from the 1904 text by script/extract_goetia.rb. Mathers' spelling and capitalisation are left exactly as printed.