There is an entry in the /Patent Rolls of the Reign of Henry III/
[1225-1232] (London, 1903), p. 230 (m. 11) that might suggest an area of
future research regarding this Clementia. This entry also provides evidence
for the existence of Susanna, daughter of Llywelyn and Joan.
IORWERTH Llewelyn Ap, Llewelyn the Great, b. 1173, Aberffraw Castle, Caernarvonshire, Wales , d. 11 Apr 1240, Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales
Mother
ENGLAND Joan Princess Of, b. 1188, Of, London, Middlesex, England , d. 3 Apr 1236, Aberconwy, Arllechwedd Isaf, Caernarvonshire, Wales