According to Wikipedia, Críonna was a brother of Art mac Cuinn. Wikipedia, "Geoffrey Keating says he had two brothers, Connla and Crionna, who were killed by their uncle Eochaid Finn." https://en.m.wikipedia.org/wiki/Art_mac_Cuinn
― Anonymous User 3/11/2023
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https://en.m.wikipedia.org/wiki/Art_mac_Cuinn