Manannán mac Lir vs Poseidon

Lord of the sea and guardian of Tír na nÓg, the Land of Youth. He rides the waves in his chariot and cloaks the Otherworld in mist.

Manannán mac Lir is the son of **Lir**, a sea god whose name survives in the Irish Sea (Muir Meann). Though sometimes counted among the Tuatha Dé Danann, Manannán stands apart as ruler of his own realm: the **Otherworld** beyond the western sea. He was foster-father to many, including **Lugh Lámhfhada**, whom he raised and trained in the magical arts. His wife is **Fand**, a woman of the síd, though he also had dalliances with mortal women. After the Tuatha Dé Danann retreated into the fairy mounds, Manannán gave each of the gods their síd and taught them the féth fíada, the spell of invisibility that hides the Otherworld from mortal eyes.

Manannán mac Lir commands the wild Atlantic, riding its waves in his chariot as easily as a mortal rides a road. His dominion extends beyond the physical ocean to encompass the **Otherworld** itself, those mystical islands beyond the sunset where the immortals feast and time moves strangely.

God of the sea, earthquakes, and horses. Brother of Zeus and Hades, ruler of the oceans and all waters.

Poseidon rules the vast oceans, earthquakes ("Earth-Shaker"), and horses. He is a moody and tempestuous god, much like the sea itself. Sailors prayed to him for safe passage, often sacrificing horses or bulls to appease his wrath.