Pope Pius V (1566–1572), the conclave chose Cardinal Boncompagni, who assumed the name of Gregory XIII in homage to Gregory the Great, a 6th-century reforming pope. It was a very brief conclave, lasting less than 24 hours. Many historians have attributed this to the influence and backing of the Spanish king. Cardinal Borromeo and the cardinals wishing reform accepted Boncompagni's candidature and so supported him in the conclave while the Spanish faction also deemed him acceptable due to his success as a nuncio in Spain. Gregory XIII's character seemed to be perfect for the needs of the church at the time. Additionally, his legal brilliance and management abilities meant that he was able to respond and deal with major problems quickly and decisively, although not always successfully. Pontificate Reform of the Church Once in the chair of Saint Peter, Gregory XIII dedicated himself to reform of the Catholic Church. He implemented the recommendations of the Council of Trent. He mandated that cardinals reside in their sees without exception, and designated a committee to update the Index of Forbidden Books. Gregory XIII was also the patron of a new and greatly improved edition of the Corpus juris canonici. In a time of considerable centralisation of power, Gregory XIII abolished the Cardinals Consistories, replacing them with Colleges, and appointing specific tasks for these colleges to work on. He was renowned for fierce independence; some confidants noted that he neither welcomed interventions nor sought advice. The power of the papacy increased under him, whereas the influence and power of the cardinals substantially decreased. Gregory XIII also established the Discalced Carmelites, an offshoot of the Carmelite Order, as a distinct unit or "province" within the former by the decree "Pia consideratione" dated 22 June 1580, ending a period of great difficulty between them and enabling the former to become a significant religious order in the Catholic Church. Formation of clergy and promotion of the arts and sciences Gregory XIII was a generous patron of the Jesuit colleges in Rome. The Roman College of the Jesuits grew substantially under his patronage, and became the most important centre of learning in Europe for a time. It is now named the Pontifical Gregorian University. Pope Gregory XIII also founded numerous seminaries for training priests, beginning with the German College at Rome, and put them in the charge of the Jesuits. In 1575 he gave official status to