Iznik lies on the intensively cultivated east side of Iznik Gölü, a lake (80m/260ft; 303sq.km/117sq.miles; max. depth 75m/260ft) occupying part of a tectonic longitudinal valley which extends from the Gulf of Gemlik into the western Pontic Mountains.
History
Iznik occupies the site of ancient Nikaia (Nicaea), founded by Antigonos Alexander the Great's general in the fourth century B.C. After suffering destruction in a number of earthquakes it was rebuilt by Hadrian and thereafter enjoyed a period of great prosperity.
In 325 Nicaea, the see of a bishop, was the meeting-place of the First Ecumenical Council (Council of Nicaea). In 787 the Seventh Ecumenical Council which condemned Iconoclasm met in Nicaea.
From 1204 to 1261, when Constantinople was capital of the Latin Empire established by the Crusaders, Nicaea was the seat of the Eastern Emperor and the Orthodox patriarch. In 1331 the town fell to the Ottomans. Under Ottoman rule it became noted for the production of beautiful enamel tiles, after Sultan Selim I brought in craftsmen from Tabriz and Azerbaijan in 1514.
Iznik's finest mosque, the Green Mosque, stands a little northwest of the Lefke Gate. Built between 1384-89, the porch is now glazed and opens on to three arches born on two granite columns. Only a few fragments remain of the original marble screens. The doorway and windows framed in calligraphic inscriptions are particularly notable features.
1km/0.75mi east of Lefke Gate rises the Barber's Rock (Berber Kayasi) with the remains of a sarcophagus 4m/13ft long. A magnificent panoramic view of Iznik can be enjoyed from the top of the rock.
The ruined Church of Hagia Sophia stands in the center of Iznik at the intersection of the two main streets which lead to the four old town gates. This was probably the meeting-place of the Seventh Ecumenical Council (787). Built in 1065 to replace an earlier church from the time of Justinian, it comprises a three-aisled basilica with small vaulted chambers on either side of the apse. In the reign of Sultan Orhan it was converted into a mosque and decorated with beautiful tiles.
Facing the Green Mosque in Iznik, to the west, stands the Imaret or Public Kitchen of Nilüfer Hatun, which was built in 1388 by Sultan Orhan's wife. It now houses the municipal museum with Greek and Roman artefacts, tombstones, Iznik tiles and inscriptions.
On a hillside 5km/3mi northwest of Iznik stands the Obelisk of Cassius (Bestas), a 12m/40ft high funerary monument to C. Cassius Philiscus (second century A.D.).
In the southwest of the old town of Iznik stands the Roman theater, said to have been built in 112 by Pliny the Younger when he was governor of Bithynia. As there was no natural slope for the theater's auditorium, the tiers were borne on massive and finely constructed vaulting.