Oxford, in central southern England, revolves around its prestigious university, established in the 12th century. The University of Oxford's collegiate system arose because the university came into existence through the gradual agglomeration of independent institutions in the city of Oxford.
The University of Oxford has 38 Colleges and 6 Permanent Private Halls, known as PPHs, of religious foundation. Colleges and PPHs are autonomous self-governing corporations within the university, and all teaching staff and students studying for a degree at the university must belong to one of the colleges.
Generally tutorials and classes are the responsibility of colleges, while lectures, examinations, laboratories and the central library are run by the university. Most colleges take both graduates and undergraduates, but several are for graduates only.