About Aed Brosc, 1st King of Dyfed
Aed Brosc was of the tribe of the Déssi who hailed from the County Waterford region of Ireland. His grandfather, Eochaid Allmuir (from Over the Sea) had left his homeland when a bid for independence by his people was severely crushed by their High-King. There is some evidence to suggest the Roman authorities asked for his help in keeping Irish pirates away from the Dyfed coast. His descendants in the area certainly used the Roman title of 'Protector' rather than king.
Please see Darrell Wolcott: Rulers of Brycheiniog- The Unanswered Questions; http://www.ancientwalesstudies.org/id161.html. (Steven Ferry, April 14, 2017.)