sentences:  The establishment of King John's castle in Limerick, and the granting of formerly Ui Fidgenti lands to the FitzGeralds, both circa 1200, and the resultant competition for Ui Fidgenti lands by other Anglo Norman families, resulted in a transfer of power from the Ui Fidgenti's leading families (O'Donovan and Collins) to the new landholders.The ancestors of both Michael Collins and the famous O'Connells of Derrynane were also among the septs of the Uí Fidgenti.As the Ui Fidgenti were the ruling clan in the Limerick after 400 a.d., the Uí Fidgenti still made a substantial contribution to the population of the central and western regions of County Limerick.