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Definition of Fergus mac Róich
1. Proper noun. (Irish mythology) The former king of Ulster during the events of the Ulster Cycle, who was ticked out of kingship by Ness, who made her 7-year-old son Conchobar mac Nessa replace him as king. The foster father of Cormac Cond Longas. ¹
¹ Source: wiktionary.com