In Christian demonology (Late Medieval- Early Modern European), Andrealphus (also spelled Androalphus) is a demon with the rank of Great Marquis of Hell, commanding 30 legions. He appears as a very noisy peacock, but can take the shape of a man. He can teach his conjurer all the mathematical sciences, including geometry, and astronomy. He can make conjurers cunning and subtle and give them good debating skill. Andrealphus is 1 of 68 demons listed in the Pseudomonarchia Dæmonum and 1 of 72 listed in the Ars Goetia (the first section of the Lesser Key of Solomon).