 Their leaders were the ancestors of the O'Brien dynasty and spawned Brian Boru, perhaps the most noted High King of Ireland, and several of whose descendants were also High Kings.By 1118, Munster had fractured into the Kingdom of Thomond under the O'Briens, the Kingdom of Desmond under the MacCarthy dynasty (Eóganachta), and the short-lived Kingdom of Ormond under the O'Kennedys (another Dalcassian sept).The three crowns of the flag of Munster represent these three late kingdoms.