Some late Roman villae had luxuries like hypocaust-heated rooms with mosaic floors; mosaics are known even from Roman Britain. As the Roman Empire collapsed, villas in Britain were abandoned. In other areas some at least survived; large working villas were donated by aristocrats and territorial magnates to individual monks, often to become the nucleus of famous monasteries. In this way, the villa system of late Antiquity was preserved into the Early Middle Ages. Benedict of Nursia established his influential monastery of Monte Cassino in the ruins of a villa at Subiaco that had belonged to Nero. Around 590, Saint Eligius was born in a highly placed Gallo-Roman family at the 'villa' of Chaptelat near Limoges, in Aquitaine. The abbey at Stavelot was founded ca 650 on the domain of a former villa near Liège and the abbey of Vézelay had a similar founding. As late as 698, Willibrord established an abbey at a Roman villa of Echternach, in Luxembourg near Trier, which Irmina of Oeren, daughter of Dagobert II, king of the Franks, presented to him.