Manannán is a Celtic sea god and associated with the Tuatha de Danaan (thoo'a-hay-day-danawn). They are the Gaelic pre-Christian pantheon that are known in Ireland, Scotland and Isle of Man. His legend is widespread throughout the Celtic lands.
His father was Lir, God of the Sea. Both Lir and his son Manannán are mentioned in the work of ‘Sanas Cormaic’ by Cormac mac Cuilennáin, King of Munster. In Cormac's 9th century glossary, he links both to the sea.
In many Celtic stories, we are told of Manannán's wife, the Fairy Queen Fand, his sons Ilbhreac (Fairy King), Fiachna and Gaidiar, and daughters Áine, Aoife and Griane. Manannán also had a foster son named Lugh; the Great Warrior, on whom he bestowed his magical belongings. Manannán, above all, is heavily associated with the Isle of Man (Mannin).
The Island’s name is derived from his and he was Mannin’s first ruler and protector. It is said he could bring down a cloak of mist that would hide the island from foreign threat. Using his magic powers he controls the wind and the waves and bring forces to defend the island.