The death of Llywelyn ab Iorwerth (known as Llywelyn Fawr), 1240
Unlike many Welsh princes, Llywelyn Fawr died a peaceful and godly death, in bed. Although his sons Gruffydd and Dafydd were united at the deathbed, they were soon locked in a violent dispute over the throne.
Reference: Corpus Christi College, Cambridge MS 16f. 132r (date: mid-13th century) By permission of the Master and Fellows of Corpus Christi College, Cambridge.