After conquering Edirne ( Adrianople ) in East Thrace , the Ottomans turned it into the new capital city in 1363 .
Bursa retained its spiritual and commercial importance in the Ottomans   .
After conquering Edirne ( Adrianople ) in East Thrace , the Ottomans turned it into the new capital city in 1363 , but Bursa retained its spiritual and commercial importance in the Ottoman Empire .