Beleth

In demonology, Beleth also spelled Bilet, Bileth, Byleth and Bilith is a mighty and terrible king of Hell, who has eighty-five legions of demons under his command. He rides a pale horse, and all kinds of music is heard before him, according to most authors on demonology and the most known grimoires. According to Pseudomonarchia Daemonum Ham, Noah's son, was the first in invoking him after the flood, and wrote a book on Mathematics with his help.