Circa 1300. June
Ottoman Turks led by Osman I begin the Ottoman Empire's expansion from their base in Anatolia. Under Osman and his successors, the Ottomans gradually conquered neighboring territories, starting with the Byzantine lands in western Anatolia and later expanding into the Balkans and beyond.
This initial expansion was facilitated by the decline of the Byzantine Empire's frontier defenses and a growing number of people seeking new opportunities. Osman and his followers engaged in military campaigns, raids, and diplomacy to expand their territory.
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