In September 1305, Edward ordered Robert Bruce to put his castle at Kildrummy, "in the keeping of such a man as he himself will be willing to answer for," suggesting that King Edward suspected Robert was not entirely trustworthy and may have been plotting behind his back. However, an identical phrase appears in an agreement between Edward and his lieutenant and lifelong friend, Aymer de Valence. A further sign of Edward's distrust occurred on 10 October 1305, when Edward revoked his gift of Sir Gilbert de Umfraville's lands to Bruce that he had made only six months before.