Parliamentary Vasudan Empire
The Parliamentary Vasudan Empire (abbreviated as PVE or VPE) was a union of Vasudan-held planets that formed the Vasudan Empire. The space-based military wing of the PVE is known as the Parliamentary Vasudan Navy (PVN). Curiously, the corresponding GTA/GTN appears much less often.
The capital of the PVE was Vasuda Prime until it was devastated by SD Lucifer in 2335. Afterwards, the capital was moved to Aldebaran.
FreeSpace 2 describes the ruling Parliment of Vasuda circa the Great War as having been plagued with Byzantine infighting and serious corruption; whatever the civilian government's faults the PVN seems not to have been seriously affected by them. As Khonsu II dissolved the Parliament of Vasuda without provoking a noteable upheaval in Vasudan society, the powers of the Emperor even under the Parliamentary system must have remained relatively broad.