Galaxy on the Brink
The Galactic Center of Coruscant, originally called Notron, was the political hub of the galaxy for millennia. It was generally agreed that Coruscant was, during most of Galactic history, the most politically important world in the galaxy.
The actual planet-wide metropolis of Coruscant was divided into smaller ‘cities’, (though each was the size of the average country by most standards). Among these was the administrative center, known as Galactic City, Republic City, Coruscant City or the City of Spires.