Domnall Mór Ua Cellaigh, 42nd King of Uí Maine and 9th Chief of the Name, died 1221.
Domnall Mór's reign is one of the most obscure of the High Medieval kings of Uí Maine.
While the Ua Conchobair succession dispute regularly devastated Connacht and the Anglo-Irish began raids and settlement west of the Shannon.
Domnall Mór is notable for the claim, noted by John O'Donovan as recorded in a Trinity College Dublin pedigree of the Mac Eochadha (Keogh) family, that he was the common ancestor of all the extant branches of the Uí Cellaigh Uí Maine.
This may simply mean that, while other lines had lost lands and status and became peasants, most of his bloodline continued to exist among the gentry after the collapse of Gaelic Ireland.