Skrp

A leader of the rats living in the dungeons at the royal palace. His people were given a lesson in realpolitik by the Patrician when he was briefly incarcerated in his own dungeon. (Guards! Guards!) This enabled the rats to come out on top in a three-way war with the scorpions and the venomous snakes, which they had hitherto been losing, and gave Vetinari a hobby while he was incarcerated. Although, as Vimes mused when flung into the same dungeon, other prisoners in similar circumstances were just content to raise caged birds or something...

These rats are remarkably similar to the Rats of The Clan in many ways. Vetinari muses that they must have been feeding on the magical dumping grounds outside Unseen University, which is exactly how the members of the clan developed their intelligence - and, not incidentally, how a certain charismatic feline chanced upon his own suddenly-expanded worldview.