sentences:  This is symbolized by many Orthodox churches being converted into Roman Catholic properties and churches like Hagia Sophia and Church of the Pantokrator, and it is viewed with some rancor to the present day.Some of the European Christian community actively endorsed the attacking of Orthodox Christians.The Teutonic Order's failed attempts to conquer Orthodox Russia (particularly the Republics of Pskov and Novgorod), an enterprise endorsed by Pope Gregory IX, can also be considered as a part of the Northern Crusades.