To make violent strenuous efforts against opposition is one definition of struggle. The conquest, colonization, and conversion of Albion between 1066 and 1284 is certainly one such struggle.
The peoples England, Scotland, Ireland, and Wales, were all involved in this struggle. This book by David Carpenter deals mostly with the Welsh and Scottish against the Normans. Since my own family tree climbing (genealogy) involved the struggle between the Welsh and Normans, it seemed like an important subject to try and get a handle. The regions and political divisions of Wales were important for me to sort out. Wales by 1200 AD was a back and forth between the Anglo-Saxon : Norman powers leading to the wars of Edward I. This book covers the waterfront.
First published in 2003 by Allen Lane, it was then published by Penguin Books in 2004. Maps and genealogical tables are helpful. [Includes the dynasty of Gwynedd, Deheubarth, and Powys.] A good read for those with Welsh genes among the trees...:-).