Edirne, historically known as Orestias, Orestiada, Adrianople, or Adriana is a city in Turkey, in the northwestern part of the province of Edirne in Eastern Thrace. Situated 7 km (4.3 mi) from the Greek and 20 km (12 mi) from the Bulgarian borders, Edirne was the second capital city of the Ottoman Empire from the 1360s to 1453, before Constantinople became its capital.