ap Llywelyn (c. 1215 – February 25 , 1246 ) was Prince of Gwynedd from 1240 to 1246. He was for a time recognised as Prince of Wales (no children), and Gruffydd ap Llywelyn (c. 1200 – March 1 , 1244 ) was the illegitimate son of Llywelyn the Great ("Llywelyn Fawr"). As