Cairbre Crom is regarded as the last of the semi-historical kings of Uí Maine, his floruit estimated to be the second quarter of the 6th century.
He was a descendant of Máine Mór, who founded the kingdom of Uí Maine about the middle years of the 4th-century.
His pedigree is given thus: Cairbre Crom mac Feradhach m. Lughaidh m. Breasal m. Dallán m. Maine Mór m. Eochaidh Cairbre's notability is as the ancestor of almost all subsequent rulers of both Uí Maine and Síol Anmchadha, from the early historic period into the early modern era, a period of over one thousand years.
Cairbre Crom's descendant Anmchadh mac Eogan Buac (died c. 757), founded the kingdom of Síol Anmchadha, which was referred to as deiscert O Maine (southern Uí Maine).
Eoghan Finn was the ancestor of King Tadhg Mór Ua Cellaigh (died 1014), from whom descend the Clann Ó Cellaigh or Kelly of County Galway, who were referred to as tuaiscert O Maine (northern Uí Maine).