Manannan had many magical items. He gave Cormac his magic goblet of truth; he had a ship that did not need sails; he owned a cloak that granted him invisibility; a flaming helmet; and a sword that could never miss its target.
Manannan left his wife, Fand, and she fell in love with Cuchulainn. Since a mortal and fairy (Fand was Queen of the fairies) could not stay together without destroying the fairy, Manannan erased their memories of each other.
He raised many foster children:Isle of Man, Manannan mac Lir was known as Mannan. On Midsummer Eve, people offered green grass to Mannan-beg-mac-y-Leir and prayed for blessings in seafaring and fishing. He was believed to be a magician who could make an illusory fleet from pea shells in order to discourage would-be invaders.