naval-based warfare became something of a regular occurrence in early 12th century ireland. the annals of inisfallen note raids of this nature occurring in 1100, 1101, 1119, and 1124. perhaps this was what led to tairrdelbach mac ruaidri ua conchobair to build dún béal gallimhe in 1124. it was located in clan fergal, the territory of the o hallorans but was supervised by ua conchobair's vassals, the ua flaithbheartaigh, who at this time were still based in their homeland of maigh seola.