The next day they were married, and the Emperor Maxen Wledig gave Helena as dowry all Britain for her father, the son of Caradoc, and for herself three castles, Caernarvon[21], Caerlleon[22], and Caermarthen[23], where she lived in turn; and in one of them was born her son Constantine, the only British-born Emperor of Rome. To this day in Wales the old Roman roads that once connected Helena’s three castles are known as “Sarn Helen.”