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1250 CE
1260 CE
1270 CE
1280 CE
1290 CE
1300 CE
1310 CE
1320 CE
1258 CE - 1323 CE: Life of Osman I.
1280 CE: Osman I succeeds his father Ertuğrul as ruler of his territory.
1299 CE - 1326 CE: Reign of Osman I.
1299 CE: Osman I’s forces lay siege to Nicaea.
1300 CE: Osman I’s forces capture the city of Yenşiehir and make it the first capital of Osman’s Beylik.
1301 CE: The Byzantine Empire breaks the siege of Nicaea.
1302 CE: Osman I’s forces defeat the Byzantines at the Battle of Bapheus.
1308 CE: The Bithynian capital of Prusa is put under siege by Osman I and his army.
1323 CE: Osman I dies and his son Orhan succeeds him.
1326 CE: Orhan successfully captures the city of Prusa, which he renames Bursa.