The Elder Scrolls Online - Cyrodiil

Cyrodiil, the Imperial Province, is located in the centre of Tamriel, and is home to the Imperial City, the capital of Tamriel since the days of Tiber Septim. The Imperials are currently at war with each of the three factions, who are trying to gain control of the Imperial City and thus the Imperial Throne. Presumably due to the widespread conflict within the province, it is not available until late in the main quest line. Cyrodiil was the setting of The Elder Scrolls IV: Oblivion.