The record of 6th-century kings in Munster is obscure and the Laud Synchronisms may have been written to favour his dynasty.
[4] He was the ancestor of the Eoganacht Glendamnach (Glanworth, County Cork) branch of the family.
He had five sons including Coirpre Cromm mac Crimthainn (died 577), a king of Munster.
The genealogies give him a twin brother Crimthann, son of a woman named Dearcon, who was an ancestor of the Airthir Cliach branch (around Tipperary town).
In which case he would be the Crimthann, son of Dearcon mentioned in a tract relating to a Munster synod in the 6th century[5]