He subscribed the papal bulls between 4 May 1207 and 26 January 1230. He was sent on a diplomatic mission to Constantinople in 1213. During this two-year mission he attempted to close Orthodox churches and imprison the clergy, but this caused such domestic upset that Henry of Flanders, the Latin Emperor of Constantinople, reversed his actions which had caused the "tempest which held the city of Constantine in its grip", as noted a contemporary historian.
Between May 4, 1207, and January 26, 1230, he subscribed to papal bulls. In 1213, he was sent on a diplomatic mission to Constantinople. During his two-year journey, he sought to close Orthodox churches and imprison the clergy, but this led to domestic unrest that caused Henry of Flanders, the Latin Emperor of Constantinople, to reverse his actions, which had resulted in "the storm that held Constantine's city under its control," as noted by a contemporary historian.