In medieval times, the village of Cosmeston, near what is today Penarth in the south east of the county, grew up around a fortified manor house constructed sometime around the 12th century by the De Costentin family. The De Costentins, who originated on the Cotentin peninsula in northern France, were among the first Norman invaders of Wales in the early 12th century following William the Conqueror's invasion of neighbouring England in 1066. The village would have consisted of a number of small stone round houses, or crofts, with thatched roofs.