Angels are invisible forces, mediators between God or the Source of Life and the World. They are purely spiritual creatures, sometimes having ethereal body, playing the role of messengers, guardians, protectors, etc. Angels form the Army of God, his Court, his House. They play an important role in the Bible. They are organised in hierarchies of seven Orders, nine Choirs and three Triades. Their hierarchy depends on their proximity to the throne. Six-winged angels are called Seraphs. They surround the throne of God. The three main Archangels are Michael (winner of the dragons), Gabriel (messenger and initiator) and Raphael (guide of the doctors and travelers). In alchemy, the angel symbolizes sublimation, the ascension of a volatile (spiritual) principle.