The essential idea of a university is a distinctly mediaeval one; the Middle Ages were above all things gifted with a genius for organization, and men were regarded, and regarded themselves, rather as members of a community than as individuals. The student in classical times had been free to hear what lectures he pleased, where he pleased, and on what subjects he pleased, and he had no fixed and definite relations with his fellow students. There is little or no trace of regular courses of study, still less of self-governing bodies of students, in the 'universities' of Alexandria or Athens. But with the revival of interest in learning in the eleventh and twelfth centuries, the real formation of universities begins. The students formed themselves into organized bodies, with definite laws and courses of study, both because they needed each other's help and protection, and because they could not conceive themselves as existing in any other way. These organized bodies were called 'universitates'[8], i.e. guilds or associations; the name at first had no special application to bodies of students, but is applied e.g. to a community of citizens; it was only gradually that it acquired its later and narrower meaning; it finally became specialized for a learned corporation, just as 'convent' has been set apart for a religious body, and 'corps' for a military one. [Sidenote: The origin of Oxford University.] When these organized bodies were first formed is a question which it is impossible to discuss at length here, nor could a definite answer be given. The University of Oxford is, in this respect, as in so many others, characteristically English; it grew rather than was made, like most of our institutions, and it can point to no definite year of foundation, and to no individual as founder. Here it must suffice to say that references to students and teachers at Oxford are found with growing frequency all through the twelfth century; but it is only in the last quarter of that century that either of those features which differentiate a university from a mere chance body of students can be clearly traced. These two features are organized study and the right of self-government.