Baldus was the master of Pierre Roger de Beaufort, who became pope under the title of Gregory XI, and whose immediate successor, Urban VI, summoned Baldus to Rome to assist him by his consultations in 1380 against the anti-pope Clement VII.
The latter, acting as the legate of Pope Gregory XI, directed the savage murder of between 2,500 and 5,000 civilians.
In 1372 he was able to come to peace terms with Naples and Pope Gregory XI, obtaining the title of tributary King of "Trinacria".
The Great Schism was initiated by the election of two popes after the death of Pope Gregory XI in the same year.
Even after he left his Church career, Jan continued to receive the revenues generated from his former title of Scholastic in Krakow, which caused the intervention of Pope Gregory XI: Jan was forced to pay 5,000 fines and 500 florins as compensation for damages.
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By the 14th century the monastery had entered a decline, and in 1373 was granted to the Carthusians of Pisa Charterhouse by Pope Gregory XI, under the influence of Saint Catherine of Siena.
Philippe returned to Cyprus in 1368, but was still at Venice when Peter was assassinated at Nicosia at the beginning of 1369, and he remained there until 1372, when he went to the court of the new pope Gregory XI at Avignon.