According to the demonologist Johan Weyer, Bitru is a
great Prince of Hell, also known as Sytry. He appeared in the
form of a leopard with the wings of a griffin. But whenever he
adopted a human appearance, it was invariably one of great
beauty. It is he who awakes lust in the human heart. Seventy legions
obey his commands.
Weyer, Johannes. Witches, Devils, and Doctors in the Renaissance
Johann Weyer, De Praestigiis. Edited by George Mora.
Binghamton, N.Y. Medieval and Renaissance Texts and