They begged, after the approved manner of the great church-builders of the Middle Ages, from the archbishop downwards, and their begging was so successful that they built the nave, as we now have it, and the chancel. In order to secure an appearance of uniformity, the architect unfortunately altered Adam de Brome's chapel, encasing the outer walls in the new style, and inserting larger windows. Not content with this, he likewise converted the old House of Congregation by substituting a row of large for two rows of small windows, giving thereby a false impression from the outside, as if the upper and lower stories were one. The University had no right to the use of S. Mary's. The church was merely borrowed for sermons and meetings of Congregation, just as S. Peter's in the East was borrowed for English sermons and S. Mildred's for meetings of the Faculty of Arts. For the University in its infancy had little or no property of its own. It could not afford to erect buildings for its own use. The parish churches, therefore, were used by favour of the clergy, and lectures were delivered in hired schools. The need for some University building was, however, severely felt. At last it was provided for in a small way. "That memorable fabric, the old Congregation House," and the room above it were begun in 1320 by the above-mentioned Adam de Brome, at the expense of Thomas Cobham, Bishop of Worcester. The latter had undertaken to enlarge the old fabric of S. Mary's Church by erecting a building two stories high immediately to the east of the tower, on the very site, that is, on which the University had previously endeavoured to found a chantry. He intended that the lower room should serve primarily as a meeting-place for the Congregations of regent-masters, and at other times for parochial purposes. The upper room was to be used partly as an oratory, and partly as a general library. But the good bishop's books, which were to form the nucleus of this library, met with the same fate as Richard de Bury's. His executors pawned them to defray the expenses of his funeral, and to pay his debts. Oriel College at their suggestion redeemed the books, and being also the impropriating rectors of the church, they claimed to treat both building and library as their own property. But the masters presently asserted their supposed rights by coming "with a great multitude" and forcibly carrying away the books from Oriel, "in autumn, when the fellows were mostly away." They lodged the books in the upper chamber, and Oriel presently acknowledged the University's proprietary rights.