John was deeply suspicious of the barons, particularly those with sufficient power and wealth to potentially challenge the king. Numerous barons were subjected to John's malevolentia, even including William Marshal, a famous knight and baron normally held up as a model of utter loyalty. The most infamous case, which went beyond anything considered acceptable at the time, proved to be that of William de Braose, a powerful marcher lord with lands in Ireland. De Braose was subjected to punitive demands for money, and when he refused to pay a huge sum of 40,000 marks (equivalent to £26,666 at the time),[nb 13] his wife and one of his sons were imprisoned by John, which resulted in their deaths. De Braose died in exile in 1211, and his grandsons remained in prison until 1218. John's suspicions and jealousies meant that he rarely enjoyed good relationships with even the leading loyalist barons.

John was deeply suspicious of who?