The Parliamentary Vasudan Empire (abbreviated as PVE or VPE) was the ruling government of the Vasudan species at the time of the Great War. The space-based military wing of the PVE is known as the Parliamentary Vasudan Navy (PVN). Curiously, the corresponding GTN (for GTA) appears much less often.
FreeSpace 2 describes the ruling Parliament of Vasuda around the time of 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. Quasi-royal Ambassadors are also known to be the intermediaries between the Emperor and the Parliament. As Khonsu II dissolved the Parliament of Vasuda without provoking a notable upheaval in Vasudan society, the powers of the Emperor even under the parliamentary system must have remained relatively broad.