United under Llewelyn Fawr (Llewelyn the Great) in 1194, the Welsh drove the Anglo-Normans from north Wales in 1212 and captured the key Marcher town of Shrewsbury in 1215. Thereafter they resisted Anglo-Norman attempts to retake their territory until the invasion of 1272.
Editors. "The Welsh expel the Anglo-Normans ". The Literary Encyclopedia. First published 28 March 2013
[http://www.litencyc.com/php/stopics.php?rec=true&UID=19342, accessed 19 September 2014.]