 's head was carried through London on a spear; his baby daughter was locked in the priory at Sempringham, where she remained until her death 54 years later.The English interpretation of the treason of was that his fiefdom had escheated to the king.The Statute of Rhuddlan in 1284 provided the constitutional basis for a post-conquest government of the Principality of North Wales from 1284 until 1535/36.