Marquis is the second largest rank in the catalogue. Fifteen of the seventy-two hold it, commanding 437 legions, with individual counts running from 19 to 50 and clustering more tightly around the middle than any other rank manages.
The title's origin in the human world is specific and military. A marchio was the lord of a march, a border province, and the office was created in the Carolingian empire for exactly the reason such offices are usually created: a frontier needs a commander with more independence than an ordinary count and cannot wait for instructions from the centre. Later European peerages kept the word and lost the frontier, so that marquess or marquis settled into a fixed step of precedence between duke and earl.
The Goetic catalogue takes it at that later value, and the way it does so is worth noticing. The ranks it uses are not scattered at random through the seventy-two. They preserve the order of precedence of a European peerage, king above duke above marquis above earl, with the civil office of president threaded alongside and a single knight at the bottom. Whoever assembled the hierarchy was borrowing a structure and not merely a vocabulary.
The fifteen are Samigina, Amon, Leraje, Naberius, Ronove, Forneus, Marchosias, Phenex, Sabnock, Shax, Orias, Andras, Andrealphus, Cimeies and Decarabia. Ronove is given as a Marquis and a Great Earl together, and is filed here under the first of the two.
Sources Lemegeton Clavicula Salomonis (The Lesser Key of Solomon)Anonymous (unidentified compiler) with Encyclopaedia Britannica (online academic reference)Encyclopaedia Britannica editors