The impact of the Great Schism on the Catholic Church in 1054 was profound, resulting in the formal division between the Catholic Church in the West and the Orthodox Church in the East. Key issues contributing to the schism included theological disputes, differences in church authority, and cultural divergences, notably the authority of the Pope versus the Ecumenical Patriarch of Constantinople. The split led to significant political, religious, and cultural changes in Europe, where each branch followed distinct liturgical practices and governance structures. The Great Schism remains a defining moment in Christian history, shaping relationships among Christian communities.