They were initially extremely successful in driving back the Angles from Bryneich territory, forcing them to vacate Din Guardi – possibly the capital - around 590 and besieging them on Ynys Metcaut (now called Lindisfarne).
Ao principio tiveran moito éxito ao repeleren os anglos do territorio de Bryneich, forzándoos a abandonaren Din Guardi – posibelmente a capital - sobre o ano 590 e cercáronos en Ynys Metcaut (a actual Lindisfarne).