Frederick was a canon regular of the Templum Domini in Jerusalem, and was appointed bishop of Acre and chancellor of Jerusalem around 1150. He participated in the Siege of Ascalon in 1153, and in 1154 King Baldwin III sent him to mediate in the dispute between the prince of Antioch, Raynald of Châtillon, and the Latin patriarch of Antioch. The patriarch returned to Jerusalem with Frederick. In 1155 Frederick accompanied the Latin patriarch of Jerusalem to Rome to complain to Pope Hadrian IV about the conduct of various abbeys and churches of Jerusalem, which had been neglecting to recognize the authority of the patriarch.