 This phenomenon may however be the result of later influences and again only the presence of the Uí Liatháin and Laigin in Wales has been verified.Historical accounts tell of the upheavals in the Roman Empire during the 3rd and 4th centuries, with notice of the withdrawal of troops from Roman Britain in support of the imperial ambitions of Roman generals stationed there.In much of Wales, where Roman troops were the only indication of Roman rule, that rule ended when troops left and did not return.