n 1209-12, John led campaigns in Ireland and Wales to take control of the lands that he had granted to William de Braose
In the campaign, Llywelyn (Prince of Wales) had seized land for himself, so John invaded Wales and demanded Llywelyn to hand over his son as hostage to ensure good behaviour
Llywelyn made an agreement in 1212 with Philip II to work with the French king against John
John prepared to launch an attack on Wales when he learnt that Llywelyn was in league with Eustace de Vesci and Robert Fitz Walter, barons who hatched a plot to kill him
Both men were angry about John’s attempts to seduce their female relations
John cancelled his Welsh campaign and marched north to re-establish his authority; both Fitz Walter and de Vesci fled into exile