A patente, in the ecclesiastical sense of the term, was an official letter expedited by a prelate and addressed to his religious subjects. Both the Father Guardian of the College of San Fernando in Mexico City and the Father President of the Franciscan missions in Alta California were regarded as prelates in the canonical sense of the term. Consequently, the friars who worked in these missions were held by religious vows to obey the admonitions and instructions in such documents. Patentes sent by the guardian of the college to his missionaries in Alta California dealt with the administration of the missions and the observance of the religious life and were supposed to be transcribed or at least summarized in a book intended for that purpose and called a Libro de Patentes.