In contrast to his father Frederick Barbarossa, marriage projects with foreign royal families were out of the question for Philip; his marriage policy was exclusively related to the dispute for the German throne. In 1203 he tried to find a balance with the Holy See through a marriage project, in which Philip wanted to arranged the betrothal of one of his daughters with a nephew of Pope Innocent III. However, Philip did not agreed with important points required by the Pope, such as carrying out a crusade, returning unlawfully confiscated goods to the Roman Church or concession to canonical elections, which was why the marriage negotiations with the Pope failed.