The territorial evolution of the Ottoman Empire spans seven centuries.
The origins of the Ottomans can be traced back to the late 11th century when a few small Muslim emirates of Turkic origins and nomadic nature—called Beyliks—started to be found in different parts of Anatolia. Their main role was to defend Seljuk border areas with the Byzantine Empire —a role reinforced by the migration of many Turks to Asia Minor. However, in 1071 and following the victory of the Sultanate of Rum over the Byzantines at the Battle of Manzikert, Beyliks sought an opportunity to override the Seljuk authority and declare their own sovereignty openly.
