Eskisehir (Turkish: Eskisehir, Turkish pronunciation: [eskiʃeˈhir], "Old City"; Latin: Dorylaeum; Ancient Greek: Δορύλαιον, Dorýlaion) is a city in northwestern Turkey and the capital of the Eskisehir Province. According to the 2009 census, the population of the city is 631,905. The city is located on the banks of the Porsuk River, 792 m above sea level, where it overlooks the fertile Phrygian Valley. In the nearby hills one can find hot springs. The city is 233 km (145 mi) to the west of Ankara, 330 km (205 mi) to the southeast of Istanbul and 78 km (48 mi) to the northeast of Kütahya.
The name Eskisehir literally means Old City in Turkish; indeed the city was founded by the Phrygians in about 1000 BC. Many Phrygian artifacts and sculptures can still be found in its Archeological Museum. There is also a museum of meerschaum stone, whose production remains still notable, used to make high quality meerschaum pipes.
Whenever it was mentioned by ancient geographers, the city was described as one of the most beautiful in Anatolia.
As with many towns in Anatolia, Christianity arrived after Constantine the Great made it the official religion of the Roman Empire. Beginning in the 4th century, records exist of bishops holding office in Eskisehir. The city was known as Dorylaeum, then. One of these bishops, Eusebius, was heavily involved in shaping the evolving dogma of the church.
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