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Ancestors and Children of the Lord Rhys

       This is the pedigree Bartrum offers for Seisyll:
       "Seisyllt arglwydd Meirionydd ap Ednywain ap Eunydd bach"
       His notes for the pedigree read:
       "Born c. 1170.  His son, Einion, was living in the time of Llywelyn the Great. (Pen 236 p. 111 quoted RWM i.1061-2 and PF i.98-99).  Einion was the ancestor of the family of Pugh of Mathafarn (see DWB) and other families in Meirionydd.  He is sometimes said to be the brother of Llywelyn (b. c. 970) ap Seisyll (e.g. Dwnn i.295, ii.107).  This is of course absurd, but it is possible that the pedigree given here belongs to Seisyll the father of Llywelyn; see note to [thye pedigree of Eunydd Bach].  There seems to be no definite information as to where Llywelyn ap Seisyll came from."
         While we agree the pedigree proposed is correct for this Seisyll, and his family constitutes a cousin line of the Peredur brothers both descended from Gwyddno ap Cadwaladr, we date his birth c. 1080.  His son was the first Einion ap Seisyll born c. 1110 and contemporary with Owain Cyfeiliog[1].  That Einion had a grandson, also named Einion ap Seisyll, born c. 1175 who did live in the time of Llewelyn Fawr.  The Pugh family of Mathafarn has both Einions in their ancestry, being descended from Huw ap Ieuan ap Dafydd Llwyd the noted bard.
          It is certainly absurd to cast Einion ap Seisyll as a brother of Llewelyn ap Seisyll, but equally as absurd to think the latter Seisyll is the man in the proposed pedigree.  He was king of Powys and Gwynedd, dying in 1023, long before Seisyll ap Ednowain was born.  We have argued that he was a member of the First Powys Dynasty[2].
           While it is likely Seisyll ap Ednowain was Lord of Ystumanner commote in Meirionydd which had its eastern border on the Dyfi river[3], during his lifetime the Gwynedd kings were also Lords of Meirionydd.  His full pedigree is:
                                   830  Gwyddno ap Cadwaladr
                                      860  Cynyr
                                     895  Clydno
                                       925  Idris
                                     960  Iswallt
                                    990  Brochwel
                                  1020  Eunydd Bach
                                  1050  Ednowain
                                   1080  Seisyll
[1]  See the paper "The Floruit of Einion ap Seisyll" at the link below:
[2]  See the paper "End of the Powys Dynasty" at the link below:
[3]  The Einion ap Seisyll of c. 1110 took his part of his father's lands to Cyfeiliog about 1070 to escape the Gwynedd man who inherited the Lordship of Meirionydd following the death of King Owain Gwynedd.