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Llywelyn the Great and Llywelyn the Last.

 If you are interested to read further, I suggest:
Medieval Wales by David Walker (Cambridge University Press 1990, ISBN 0 521 323177)
Edward I and Wales edited by Trevor Herbert and Gareth Elwyn Jones (University of Wales Press 1988, ISBN 0 7083 1012 5) 
 John Weston 
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