https://libraryireland.com/Pedigrees1/o-connor-1-heremon.php
Review starting at 113. She his son Roderick (114) and the list of siblings, it lists a sister Una who married Robert de Gernon.
113. Aodh (or Hugh): son of Cathal Craobh-Dearg; King of Connaught; d. 1228; had a brother Felim.
114. Roderick: son of Aodh; Lord of Connaught. Had five brothers; and a sister Una, who m. Robert de Gernon.
I believe that links it to this profile
Aedh mac Cathal Crobdearg Ua Conchobair, King of Connaught