The wizards held that, as servants of a higher truth, they were not subject to the mundane laws of the city. The Patrician said that, indeed, this was the case, but they would bloody well pay their taxes like everyone else. The wizards said that, as followers of the light of wisdom, they owed allegiance to no mortal man. The Patrician said that this may well be true but they also owed a city tax of two hundred dollars per head per annum, payable quarterly. The wizards said that the University stood on magical ground and was therefore exempt from taxation and anyway you couldn't put a tax on knowledge. The Patrician said you could. It was two hundred dollars per capita; if per capita was a problem, de-capita could be arranged.