 He also had to pay a large tribute in cattle and horses and to hand over hostages, including his illegitimate son Gruffydd, and was forced to agree that if he died without a legitimate heir by Joan, all his lands would revert to the king.This was the low point of Llywelyn's reign, but he quickly recovered his position.The other Welsh princes, who had supported King John against Llywelyn, soon became disillusioned with John's rule and changed sides.