Notes:

At Easter 1230, William de Braose, who was Llywelyn's prisoner at the time, was discovered with Joan in Llywelyn's bedchamber. William de Braose was hanged on 2 May 1230, according to local folklore at Abergwyngregyn; the place was known as 'Gwern y Grog'. A letter from Nicholas, Abbot of Vaudy, suggests that the execution took place at Crogen near Bala(crogi = to hang).[3]
Joan was placed under house arrest for twelve months after the incident. She was then, according to the Chronicle of Chester, forgiven by Llywelyn, and restored to favour. She may have given birth to a daughter early in 1231.
Joan was never called Princess of Wales, but, in Welsh, "Lady of Wales".

Joan — Llywelyn the Great Llywelyn ap Lorwerth Lorwerth. [Group Sheet]

1. Elena or Helen daughter of Llywelyn the Great Llywelyn

Joan — William de Braose de Braose. [Group Sheet]

King — Clemence Regina Clementina. [Group Sheet]