One of four major cycles of Old and Middle Irish literature, known to some commentators as the Historical Cycle; it is distinguished from the other three by its focus on provincial and lesser kings, both legendary and historical, from the 3rd to the 7th centuries. The cycle is concerned not only with kings but also with kingship. Critical commentators have found the cycle to be less magical than the Mythological, less heroic than the Ulster, and less romantic than the Fenian. The phrase ‘Cycle of the Kings’ was coined by Myles Dillon, The Cycles of the Kings (Oxford, 1946), who allowed that there was more than one such cycle. Alan Bruford coined the phrase Dalcassian Cycle in 1969 to refer to the stories of the 10th-century Brian Bórama (Boru) and his family, which are so extensive and particular as to be separated from the rest.
Important personages mentioned in narratives of the Cycle of the Kings are Baile and his lover Ailinn, Becfola, Cano (d. 688), Conaire Mór, Conn Cétchathach [of the Hundred Battles], Cormac mac Airt (who also figures in the Fenian Cycle), Domnall the son of Áed, Fergus mac Léti, Labraid Loingsech, Lugaid mac Con, Mongán, Muirchertach mac Erca, Niall Noígiallach [of the Nine Hostages], and Rónán




