 Order was restored in 369, but Roman Britain would not recover.It was at this time that Wales received an infusion of settlers from southern Ireland, the Uí Liatháin, Laigin, and possibly Déisi, the last no longer seen as certain, with only the first two verified by reliable sources and place-name evidence.The Irish were concentrated along the southern and western coasts, in Anglesey and Gwynedd (excepting the cantrefi of Arfon and Arllechwedd), and in the territory of the Demetae.