Who is The Patrician of Ankh-Morpork from The Colour of Magic and what is their importance?

As the overlord of Ankh-Morpork, the Patrician's main job is to keep order in the two cities he oversees. The Patrician's main goal over the course of the novel is keeping Twoflowers happy and showing him a good time. He wants Twoflowers travel guide to include a complimentary endorsement of the cities.