Cellach Cualann
Cellach Cualann mac Gerthidi (died 715) was the last king of Leinster from the Uí Máil dynasty. Cellach's byname is derived from the land of Cualu which lay around Glendalough.
Cellach's father was not king of Leinster; his second cousin Fiannamail mac Máele Tuile (died 680) was. Cellach succeeded his cousin as king of Uí Máil when Fiannamail was murdered by a servant named Fochsechán, probably on the orders of Fínsnechta Fledach. The kingship of Leinster passed to the Uí Dúnlainge in the person of Bran Mut mac Conaill who died in 693, to be followed as king by Cellach.