When most people think of Seraphim, they think of angels, but earliest usages of the term refer to serpent demons.
Angels
Angels are supernatural entities that usually appear in the form of a human, often depicted with wings and surrounded by bright white light. Angels often serve as messengers to deliver God's message or offer apocalyptic visions to human prophets. The first biblical book to mention specific Angels by name was the Book of Daniel, which describes Gabriel as God's primary messenger and Michael as the angel who fights for God. Read articles about angels below.
Cornell Has Great Online Collection of Supernatural and Fantastic Beings
The Cornell University Library has put together a wonderful online collection of the fantastic in art with 295 pictures from rare manuscripts.
John Dee
John Dee (1527-1608) was a renown philosopher, mathematician, geographer and navigator during 16th century’s Elizabethan Renaissance.
Ipos
Ipos/Ipes/ Ayperos is a prince and count of hell, who commands 36 legions. He appears as an angel or lion with the head and feet of a goose and a short hair’s tail.
Crocell
Crocell, the 49th spirit, is a great Duke who appears in the form of an angel.