The first schism in the early church was between Catholicism and Eastern Orthodoxy. The two traditions began to divide, as the Roman Empire fragmented, after the seventh Ecumenical Council in 787 CE and is commonly believed to have finally split over the conflict with Rome in the so called Great Schism in 1054. The Orthodox tradition developed from the Christianity of the Eastern Roman Empire and was shaped by the pressures, politics and peoples of that geographical area. The church use a different calendar from others, and Christmas is celebrated on the 7th of January. Easter is the supreme festival of the year.