Various institutions in Rome for the education of seminarians, most of them national. There students reside, and sometimes follow special courses; they follow the regular courses in philosophy and theology in a few large central institutions such as the Propaganda, Urban College, Gregorian University, Roman Seminary, and the Minerva (Pontifical and International College of the Angelic Doctor). The Roman Colleges are thus grouped in several clusters, each including a center for purposes of instruction and a number of affiliated institutions, having a rector, vice-rector, and spiritual director. Included among the Roman Colleges are: