Strata Florida’s support of Llywelyn ap Iorwerth, prince of Gwynedd, brought conflict with King John who threatened to destroy the abbey in 1212.
Achosodd cefnogaeth Ystrad Fflur i Lywelyn ap Iorwerth, tywysog Gwynedd, wrthdaro â'r Brenin John a fu’n bygwth dinistrio'r Abaty yn 1212.