Establishment at Yenişehir
· Yenişehir, Bursa Province, Türkiye
Wikimedia Commons · CC BY-SA 3.0 · file Osman relocated the frontier center to Yenişehir, closer to İznik and the Byzantine borderlands, making it a base for subsequent operations. The source distinguishes Bilecik as capital and Yenişehir as the frontier center.
