In 1081, having entirely subdued England, William of Normandy led a military expedition across south Wales to St. David’s in 1081. In the following decades the Normans established settlements in Pembroke and the Vale of Glamorgan.
Editors. "William of Normandy invades Wales". The Literary Encyclopedia. First published 28 March 2013
[http://www.litencyc.com/php/stopics.php?rec=true&UID=19340, accessed 28 November 2015.]