 There is a slight reference to this in "The Last Continent", when the wizards notice that they not only don't know the Librarian's name, but they also don't know the names of one another.Also, in Unseen Academicals, Ridcully has difficulty remembering the Dean's name, despite having started at UU around the same time.The head of Unseen University is the Archchancellor, considered an important figure and holds a seat on the Ankh-Morpork council (although this council itself has no power either), in which he acts as a magical advisor to the Patrician of Ankh-Morpork.