The Siege of Belasco unfolded circa 16,800 BBY on the Expansion Region planet of Belasco. This event occurred within the region under the active dominion of the Grand Companies—merchant organizations operating along the hyperlane called the Spin. These companies received support from Coruscant, the capital planet of the Galactic Republic, and Belasco was situated along hyperspace lanes overseen by Coruscant.
The Siege of Belasco represented a later stage in the First Alsakan Conflict. This conflict had begun over two centuries prior, continued for an additional hundred years, and marked the initial phase of a millennia-spanning series of wars. These wars centered on the struggle for political authority within the Republic, involving Coruscant, the world of Alsakan, and their respective associates.
The 2012 reference work, The Essential Guide to Warfare, penned by Jason Fry and Paul R. Urquhart, was the medium through which the Siege of Belasco was first presented.