Erc merupakan raja Dál Riata Irlandia hingga 474. Ia memiliki tiga putra: Fergus Mór, Loarn dan Oengus. Ia juga merupakan leluhur Muirchertach mac Muiredaig. Keraguan muncul dari matronimik yang terakhir, Macc Ercae, yang konon berasal dari ibundanya yang legendaris Erca, putri Loarn mac Eirc. Dia menikah dengan Muiredach mac Eógain.
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