The Old Mosque (Eski Camii), an early 15th-century Ottoman mosque, built on order of Emir Süleyman, and completed during the rule of his brother, Sultan Mehmet I, who ruled from 1413 to 1421. It is covered by 9 domes supported on four columns. The mosque had originally a single minaret, the taller one was later built by Murat II that century.