Jean de Carteret
Jean de Carteret, Bailiff of Jersey, 1292 and 1302
J A Messervy lists Jean de Carteret as having been Bailiff on these dates citing French historian Julian Havet's work Les cours royales des îles normandes, by the same author as an authoritative article Série chronologique des gardiens et seigneurs des îles normandes (1198-1461) on those who held office as Lord of the Isles and Warden of the Isles in the Channel Islands. The latter article has been drawn on extensively for Jerripedia's list of Lords and Wardens.
This would appear to have been the Jean de Carteret who was the son of Renaud de Carteret and grandson of Sir Philippe Carteret, who married Marguerite d'Aubigné, niece of Warden of the Isles Philippe d'Aubigné. The de Carteret lineage in the 13th century is far from certain and Jean is sometimes shown as first son of Renaud, sometimes second after his brother Philippe, but if he was Seigneur of St Ouen in succession to his father, he would have been a natural choice as Bailiff, possibly in an interim role between other appointments.