The great ship took them to Britain, they walked via Eryri to the great castle of Aber Seint in Arfon opposite Mon. Inside was the royal single-parent family still persuing the same hobbies, including the unsuspecting future empress of Rome who was underwhelmed by their story, and suggested that if Macsen really was in love with her then he should come in person. The messengers returned to Rome and guided Macsen and his war host to The Island of Britain which he duly conquered off Beli son of Manogan and his sons and drove them into the sea whilst on his way to Arfon in Wales. I guess Celtic girls are easy. Having confirmed her virginity she demanded as a maiden price the whole island of Britain and the three adjacent islands for her dad, plus three strongholds for herself at Arfon, Caer Llion and Caer Fyrddin.
Celtic girls are smart, too.
She also had roads built everywhere. Thankyou very much. Elen's brothers turned up with their Celtic warband, made ladders, got pissed and took the city over lunch before handing it to Macsen as a pressy. Cynan and Gadeon then went on to conquer all the rest of the world, slaughtering all the men and ravishing all the women, until Gadeon went home to Arfon and Cynan retired to Brittany, where, to prevent his own language being corrupted, he cut out all the womens tongues. Then Macsen woke up.