On 16 September 1312, he was granted a further extension of seven years by Pope Clement V, at the request of Bertrand's uncle, Guillaume de Mandagot, Archbishop of Aix (1311-1313), who became a Cardinal in December 1312.

[5] On 12 June 1318 Bertrand de Déaulx, Papal chaplain, was granted a canonry in the Cathedral of Narbonne, with the expectation of a non-sacerdotal prebend.

On 13 June, upon the resignation of the incumbent, Pope John XXII appointed him Archdeacon of Corberiensis (Corbières) in the Church of Narbonne.

[7] On 22 June 1322 he is mentioned in the positions of Auditor litterarum contradictarum of the Apostolic Palace (judge),[8] Provost of Embrun, and Archdeacon of Paris.

[12] The long papal absence in Avignon had allowed individual lords to expand their interests and make war against one another and against the independent city-states.

This situation was due in part by the opposition of Pope John XXII to Louis the Bavarian as claimant to the Empire.

[19] During his time in Italy, the Archbishop also undertook to revise the statutes that regulated the temporal government in his area of competence.

[25] On 9 March 1339, Pope Benedict XII issued a bull granting Cardinal Bertrand de Déaulx the task and powers of modifying and reforming the Statutes of the University of Montpellier.

The Conclave to elect his successor took place in the Apostolic Palace in Avignon and began on Sunday 5 May 1342, with eighteen cardinals in attendance, Bertrand de Déaulx among them.

The Conclave ended on the morning of Tuesday 7 May, with the election of Cardinal Pierre Roger of Limoges, who had been Chancellor of King Philip VI (1334-1338).

[29] Bertrand de Déaulx was named Apostolic Legate in the Principality of Catalonia, departing Avignon on 2 June 1344.

His purpose was to broker a peace between Peter IV of Aragon and James III of Majorca, who had been driven out of his kingdom in a brief war (1343-1344).

[30] Due to the crisis produced in southern Italy by the murder, on 19 September 1345, of Andreas of Hungary, the husband of Joanna I of Naples, Cardinal Bertrand was appointed Apostolic Legate by Pope Clement VI on 4 March 1346; on 30 March he was named Vicar General of temporalities in the States of the Church.

[33] After the uprising of Cola di Rienzo, he was ordered to Rome by Pope Clement VI to restore the senatorial regime under papal authority.

Having returned to Avignon, Bertrand de Déaulx was promoted to the Order of Cardinal Bishops on 4 November 1348, and granted the suburbicarian See of Sabina.

[37] In 1362 his executors received permission from the King of France to create two Chaplains, one in the Cathedral of Nîmes, the other in the Church of S. Maria Nova de Utecia (Uzès).