In Irish mythological history Mug Nuadat (servant of Nuada) son of Mug Neit, son of Derg, son of Dergthene, son of Enna Munchain, son of Loch Mor, son of Muiredach Mucna, son of Eochaid Garb, son of Dui Dalta Dedad was a legendary, supposed King of Munster in the 2nd century AD. He was, according to later medieval tradition, a rival of the High King, Conn of the Hundred Battles, and for a time after the year 123 was the de facto ruler of the southern half of Ireland. Everything south of a line drawn between Galway Bay and Dublin was known as Leth Moga ("Mug's half"), and everything north of that line was Leth Cuinn ("Conn's half") (Modern Irish: Leath Cuinn).