Manannán mac Lir

Manannán mac Lir ("Manannán, son of the sea") is the Tuatha Dé Danann's god of the sea and, by extension, a guardian and ruler of the Otherworld — the mysterious realm that lies across or beneath the water, reachable only by those he permits. His name is generally taken to derive from the Isle of Man, which traditional etymology links to him as a former sea-lord of that island. Manannán is less a figure of dramatic personal myth than a recurring source of aid and equipment for other heroes. He owns a ship, Wave Sweeper, that sails without oars or sail simply by his will, and a horse, Enbarr, that can travel over sea as easily as land. His most famous possession is a cloak of invisibility, and he is closely linked with a set of magical gifts collectively called the "gifts of Manannán," which he distributes to favored heroes across different cycles — most notably equipping Lugh with weapons and a boat before the Second Battle of Mag Tuired, and fostering the young Lugh in his own Otherworld realm before Lugh's arrival among the Tuatha Dé Danann. In later Fenian Cycle material, Manannán continues this role as an Otherworld patron, appearing to guide or test heroes who cross into his domain. His broader association with mist, illusion, and the boundary between the visible world and the Otherworld makes him one of the more enduring figures in Irish tradition — sea mist over the Isle of Man is still sometimes called "Manannán's cloak" in folklore.