While guardian of the convent at Tlatelolco, he assumed numerous heavy burdens, both intellectual and practical, not all of which related to the affairs of the Franciscans. Among those which did may be mentioned the fact that the guardian of the convent was "ex officio" President of the "Colegio de Santa Cruz de Tlatelolco", a post which entailed general oversight of the conduct of the institution under its rector. The College had, however, so far declined from the ambitious plans which attended its ceremonial opening in 1536 that, by the end of the 16th century, it had become an elementary school where local Indian children learnt reading, writing, manners and good behaviour.