The Cycles of the Kings, also known as the Kings' Cycles or the Historical Cycle are a body of Old and Middle Irish literature. They contain stories of the legendary kings of Ireland, for example Cormac mac Airt, Niall of the Nine Hostages, Éogan Mór, Conall Corc, Guaire Aidne mac Colmáin, Diarmait mac Cerbaill, Lugaid mac Con, Conn of the Hundred Battles, Lóegaire mac Néill, Crimthann mac Fidaig, and Brian Bóruma.