The "Kings of Leinster" refers to the rulers of the ancient province of Leinster in Ireland. This region was one of the five provinces of Ireland and played a significant role in the island's history. The kingship was often contested, with various clans and families vying for power, particularly during the early medieval period. Notable kings include Dermot MacMurrough, who sought assistance from the Normans in the 12th century, and Brian Boru, who, although primarily associated with Munster, had influence over Leinster. The legacy of these kings is evident in the historical and cultural landscape of modern Ireland.