John was active politically and militarily, although less influential than the previous lords of Caesarea had been.
Therein John writes that his cousin, the lord of Caesarea, refused the bailliage (regency) of the kingdom in 1243, and instead the Haute Cour gave it to Queen Alice of Cyprus.
[1] Some of the money from the sales to the Hospitallers was used to pay the dower of John's brother Hugh's wife, Isabelle de Tenremonde, of the family of the lords of Adelon.
In 1254, after Louis IX of France and the Seventh Crusade had departed, John and some other barons of the kingdom wrote a letter to Henry III of England requesting aid.
He does not appear again in contemporary records, but was still alive as late as 1264, when his son Hugh, the "heir of Caesarea", was killed in a fall from his horse.