The final private owner was the Countess Isabella de Fortibus, who, on her deathbed in 1293, was persuaded to sell it to Edward I, and so it came under control of the English crown.
The final private owner was the Countess Isabella de Fortibus, who inherited it aged 25 after her brother died suddenly. On her deathbed in 1293 she was persuaded to sell the island to Edward I, and so it came under control of the English crown.