Fun fact, I was browsing Pseudomonarchia Daemonum, a daemonology compendium first produced in 1583 (link here), and I found our friend Ronove –
Ronove [Roneve] a marquesse and an earle, he is resembled to a monster, he bringeth singular understanding in rhetorike, faithfull servants, knowledge of toongs, favour of freends and foes; and nineteene legions obeie him.
Which is pretty apt. It seems he shows up in the Goetia (link here), too.
The 27th spirit is called Ronove, he appeareth in ye forme of a Monster, he teacheth ye art of Rhetorick very well, and giveth good servants knowledge of Tongues, favouer of friends & foes; he is a Marquiz & a great Earle, and there obeieth him [he commandeth] 19 Legions of spirits his seal is this.
The Goetia has his seal, which is neat-looking. (I’m only on Episode 4, so I don’t know if he gets a cool monster form later … but I’ll still post this here since there isn’t, understandably, a spoiler-free thread for Ronove or for Gaap. Gaap’s in here, too!)