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Early Expansion of Osman Bey
Around 1290, Osman Bey began pushing into the Byzantine Bithynian frontier from his father Ertuğrul's Söğüt–Yenişehir border lordship, laying the fou…
Timeline
- 1290Söğüt · TurkeyAfter his father Ertuğrul's death (around 1281), Osman took over the position of uç bey (frontier bey), based at Söğüt, situated at the junction of the Seljuk of Rum–Mongol vassal system and the Byzantine Bithynian frontier.
- 1291–1293Bithynian frontier · BithyniaThe Ottoman tribe launched sustained raids against Byzantine frontier castles and towns; according to Ottoman traditional sources, they achieved early victories around 1291 at places like Karacahisar, attracting more Turkic nomads and ghazis.
- 1295Yenişehir · TurkeyOsman shifted his center of operations westward to Yenişehir, very close to the Byzantine heartland, marking his transformation from a frontier ucbey into a regional power and laying the groundwork for attacks on key sites like Bursa in the early 14th century.
Sources
- The Ottoman Empire, 1300–1650: The Structure of Power — Colin Imber (2002)
- The Cambridge History of Turkey, Volume 1: Byzantium to Turkey, 1071–1453 — Kate Fleet et al. (2009)