When Richard died on 6 April 1199, the archbishop invested Richard's youngest brother John as duke of Normandy on 25 April 1199. At the ceremony, John pledged to protect the Norman church, and soon afterwards confirmed the grant of Dieppe and the other manors to the archdiocese. John contested the right of the archbishop to some jurisdictional rights however, as well as forest rights, forcing Coutances to pay 2,100 Angevin pounds to secure most of the contested rights. In May 1200, Coutances was involved in the peace treaty of Le Goulet between King John and King Philip of France, but took no active part in the Angevin defence of Normandy.