What is the Capital of Cyrodiil?

Imperial City is the capital that's in a large island in the middle of Lake Rumare, and was the ancient seat of power of the Empire of Tamriel back then when there were emperors of the Septim Dynasty ruling the empire, before the Obilivion Crisis and the Elder Council were unable maintain peace in Cyrodiil, placing new emperors on the throne -- none of which were well-taken by the People of the Empire. Sometime after that during year 17 of the Fourth Era. The Colovian warlord Titus Mede I conquered Imperial City with just a thousand men and crowned himself emperor, and the First non-Dragonborn emperor, and there it began the Mede Dynasty