On 8 October 1451, in the bull "Regis Aeterni", Pope Nicholas V abolished the patriarchate of Grado, and transferred its powers and privileges to the Archdiocese of Venice.

[7] Never discouraged in their pursuit of power, the Canons who supported Uberto then held another election, and chose Leonardo Faletrum of Venice as bishop of Chioggia.

Before that election could proceed to a confirmation by anyone, Aliro's lawyer, Joannes Vandalinus, lodged an appeal to the papal court against Leonardo, his electors, and the Patriarch of Grado.

The pope then voided the elections and, on 17 June 1286, appointed the bishop of Castello, Bartolomeo Quirini,[8] as Apostolic Administrator of the diocese.

[9] It was not until 11 January 1287 that Pope Honorius IV provided (appointed) a new bishop, Stephanus Betani, a parish priest from Venice.

They were not able to come to an agreement on one candidate, and a cleric of Chioggia, Marco Guandelini, entered an appeal to the Holy See in opposition to the chancellor.

[14] Then, on 22 August 1322, John XXII provided (appointed) Father Andreas to the bishopric of Chioggia, Apostolicae Sedis gratia.

[15] On 25 January 1348, during the episcopate of Bishop Pietro da Clusello, the lower Po Valley was struck by two very large earthquakes, which were felt as far away as Trent, Piacenza, Modena, and Dalmatia.

At Chioggia, by 1 August 1348, the situation was so bad ("propter pestem mortalitatis multum est de populata") that the Podestà and Great Council that those who had been condemned and were under the ban (banished) were granted grace and remission.

Chioggia's most distinguished citizen, Achino degli Orsi Carnelli, who was a Canon of the cathedral of Chioggia and a professor of Canon Law at the University of Padua, died of the plague: Hunc Decreta docentem Padua stravit In medio Madi: fuerat tum maxima pestis.

Bishop Fiamma (1584–1585), with the agreement of the Podestà of Chioggia, permitted the establishment of the first Capuchin house in his diocese, on 15 March 1584.

The result was the withdrawal of the right of Canons who were Venetian public notaries and chancellors to conduct civil business with and for the people of Chioggia.

The Doge and Council of Venice, however, were displeased with the uproar, and in a letter of 24 July 1319 to the new Podestà (by which time Bishop Ottonellus had died and Dandalo's term had ended), ordered that both sides should withdraw their actions.

Rebuilding began immediately, though the cornerstone was laid by the Podestà, not by Bishop Pietro, who was in Venice on business.

(1544–1569) held diocesan synods in 1545 and 1564; the latter was a lengthy informational session on the recently concluded Council of Trent and its decrees.