# Merlin a magician in the legends of King Arthur and Celtic myth who was the force behind Arthur's achievement of the throne and otherwise instructed him, insuring his continuing invincibility and future greatness as king He performed such feats as calling dragons out of the ground, predicting the future into the 1100s and removing the great stones of Stonehenge from Ireland to Amesbury (the current site of Stonehenge, in England on the Avon River) by his magic.