At the end of the thirteenth century, with the Seljuk Sultanate of Rum in terminal decline, Anatolia was divided into several small independent Turkish principalities, called beyliks. One of these beyliks, bordering the Orthodox Christian Byzantine Empire, was led by Osman I. Osman's tiny state would gradually expand over the next two hundred years to become one of the world's great empires, known to posterity as the Ottoman (Osmanli) Empire, after their first leader. At first the Ottomans battled against the Byzantines for control of the local Anatolian cities, but in 1354 they seized their first European territory when they took Gallipoli. This brought them into conflict with the other Balkan Christian states, including Serbia, Bulgaria, Hungary, Wallachia, Moldavia and Albania. The Ottomans were generally victorious in these wars for the next fifty years, resulting in them becoming the dominant Balkan power. Their advances led to the Battle of Nicopolis in 1396, where a western crus