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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.
As Bishop he undertook a diplomatic mission to pope Urban VI on behalf of Wladyslaw Jagiello, the result of which was a Papal Bull of 12 March 1388 forming a bishopric in Vilnius, and between 1386 and 1394 he was a papal collector.
Refusing to support Bartolomeo Prignano (Pope Urban VI, the former head of the rival Apostolic Chancellery) after the Papal Conclave of 1378, Murat de Cros played a critical role in delivering a considerable portion of the Roman Curia to the rival claimant Robert of Geneva, who took the name Clement VII.