The Byzantine Empire had ruled most of the Greek-speaking world since late Antiquity, but experienced a decline as a result of Muslim Arab and Seljuk Turkish invasions and was fatally weakened by the sacking of Constantinople by the Latin Crusaders in 1204. The establishment of Catholic Latin states on Greek soil, and the struggles of the Orthodox Byzantine Greeks against them, led to the emergence of a distinct Greek national identity. The Byzantine Empire was restored by the Palaiologos dynasty in 1261, but it was a shadow of its former self, and constant civil wars and foreign attacks in the 14th century brought about its terminal decline. As a result, most of Greece gradually became part of the Ottoman Empire in the late 14th and early 15th centuries, culminating in the Fall of Constantinople in 1453, the conquest of the Duchy of Athens in 1458, and of the Despotate of the Morea in 1460.