Llywelyn Eurdorchog 1
Llywelyn married Efa verch Bleddyn, daughter of Bleddyn ap Cynfyn King of Gwynedd and Powys and Unknown.1
1 P.C. Bartrum, Aberystwyth University, <i>Prosiect Bartrum/Bartrum Project</i> (https://cadair.aber.ac.uk/dspace/handle/2160/4026 : accessed 30 Jun 2020), Bleddyn ap Cynfyn 1, Llywelyn Eurdorchog 1.
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