He was one of the seven cardinals who, in May 1408, deserted Pope Gregory XII, and, with those following Antipope Benedict XIII from Avignon, convened the Council of Pisa, of which Cossa became the leader.

The aim of the council was to end the schism ; to this end they deposed Gregory XII and Benedict XIII and elected the new pope Alexander V in 1409.

John XXIII was acknowledged as pope by France, England, Bohemia, Prussia, Portugal, parts of the Holy Roman Empire, and numerous Northern Italian city states, including Florence and Venice ; however, the Avignon Pope Benedict XIII was regarded as pope by the Kingdoms of Aragon, Castile, and Scotland and Gregory XII was still favored by Ladislaus of Naples, Carlo I Malatesta, the princes of Bavaria, Louis III, Elector Palatine, and parts of Germany and Poland.

The main enemy of John was Ladislaus of Naples, who protected Gregory XII in Rome.

During the third session, rival Pope Gregory XII authorized the council as well.

Though Alexander and his successor, John XXIII, gained widespread support, especially at the cost of the Avignon pope, the schism remained, now involving not two but three claimants: Gregory XII at Rome, Benedict XIII at Avignon and John XXIII.

This decree, however, is not considered valid by the Magisterium of the Catholic Church, since it was never approved by Pope Gregory XII or his successors, and was passed by the Council in a session before his confirmation.

Gregory XII then sent representatives to Constance, whom he granted full powers to summon, open and preside over an Ecumenical Council ; he also empowered them to present his resignation to the Papacy.

On 4 July 1415 the Bull of Gregory XII which appointed Malatesta and Cardinal Dominici of Ragusa as his proxies at the council was formally read before the assembled Bishops.

The cardinal then read a decree of Gregory XII which convoked the council and authorized its succeeding acts.

Prince Malatesta immediately informed the Council that he was empowered by a commission from Pope Gregory XII to resign the Papal Throne on the Pontiff's behalf.

Thereupon the commission by Gregory XII authorizing his proxy to resign the Papacy on his behalf was read and Malatesta, acting in the name of Gregory XII, pronounced the resignation of the papacy by Gregory XII and handed a written copy of the resignation to the assembly.

Former Pope Gregory XII was then created titular Cardinal Bishop of Porto and Santa Ruffina by the Council, with rank immediately below the Pope ( which made him the highest-ranking person in the Church, since, due to his abdication, the See of Peter was vacant ).

* 1409 – Western Schism: the Roman Catholic church is led into a double schism as Petros Philargos is crowned Pope Alexander V after the Council of Pisa, joining Pope Gregory XII in Rome and Pope Benedict XII in Avignon.

Boso drew on Bonizo of Sutri for popes from John XII to Gregory VII, and wrote from his own experiences about the popes from Gelasius II ( 1118 – 1119 ) to Alexander III ( 1179 – 1181 ).

A papal dispensation was also necessary for the marriage to take place, as the couple was closely related, and was issued by Pope Gregory XII on 6 December 1374.

Riots broke out in Germany, a new Antipope Gregory VIII was appointed by the German king, nobles loyal to Rome seceded from Henry.

The order was appointed by Pope Gregory IX the duty to carry out the Inquisition.

In 318, Gregory appointed his second son Aristaces as the next Catholicos in line of Armenia's Holy Apostolic Church to stabilize and continue strengthening Christianity not only in Armenia, but also in the Caucasus and Anatolia.

In 1576, Macau was established as an episcopal see by Pope Gregory XIII with Melchior Carneiro appointed as the first bishop.

As archbishop, he was appointed papal legate to France by Pope Paschal II during the time that Paschal was induced under pressure from Holy Roman Emperor Henry V to issue the Privilegium of 1111, by which he yielded much of the papal prerogatives that had been so forcefully claimed by Pope Gregory VII in the Gregorian Reforms.

According to prior agreement, they agreed to retain all the cardinals that had been created by Gregory XII, thus satisfying the Correr clan, and appointed Gregory XII Bishop of Frascati, Dean of the Sacred College of Cardinals and perpetual legate at Ancona.

Gerbert now became the teacher of Otto III, and Pope Gregory V ( 996 – 999 ), Otto III's cousin, appointed him Archbishop of Ravenna in 998.

Boniface returned to the continent the next year, and this time went straight to Rome, where Pope Gregory II renamed him " Boniface ", for the ( legendary ) fourth-century martyr Boniface of Tarsus, and appointed him missionary bishop for Germania -- he became a bishop without a diocese for an area that lacked any church organization.

* January 24 – Afonso Mendes, appointed by Pope Gregory XV as Prelate of Ethiopia, arrives at Massawa from Goa.

At the age of twenty-four he was appointed by his uncle Pope Gregory XII as Bishop of Siena and came into prominence.

Cardinal Secretary of State Luigi Lambruschini introduced him to Vatican congregations and to Pope Gregory XVI, who appointed Pecci on 14 February 1837, as personal prelate even before he was ordained priest on 31 December 1837, by the Vicar of Rome.

Shortly thereafter, Gregory XVI appointed Pecci as legate ( provincial administrator ) to Benevento.

Upon completion of the tax reforms, Gregory XVI appointed Pecci to be administrator of Spoleto, a province with 100, 000, and then Perugia with 200, 000 inhabitants.

On 27 April 1843, Pope Gregory XVI appointed Pecci Archbishop of Damiette and asked his Cardinal Secretary of State Lambruschini to consecrate him.

In 1776 Pius VI appointed the 34-year-old Dom Gregory, who had been teaching at the Monastery of Sant ' Anselmo in Rome, as honorary abbot in commendam of his monastery.

In December 1782 the pope appointed Dom Gregory as the Bishop of Tivoli, near Rome.

Joel B. Peck, H. A. Cook ; 1879, William Moul ; 1880, C. Snyder ; 1881, Albert Kilmer ; 1882, Ezra W. Knowlton ; 1883, William Moul ; 1884, B. J. L. Sliter ; 1885, Albert Kilmer ; 1885, A. H. Cipperly ( appointed to fill, vacancy ); 1886, A. H. Cipperly ; 1887, Addison P. Lape ; 1888, C. Snyder ; 1889, Albert Kilmer ; 1890, Addison P. Lape ; 1891, Addison TJline ; 1892, E. M. Gregory, Le Grand M. Turner ( appointed to fill vacancy ); 1893, Sanford B. Horton ; 1894, Le Grand M. Turner ; 1895, Addison Uline ; 1896, Aipheus Bailey.

He was named provincial prior of the Dominicans for England in 1261, and in October 1272 Pope Gregory X appointed him as Archbishop of Canterbury to end a disupte over the election.

On November 21, 1843, McCloskey was appointed Coadjutor Bishop of New York and Titular Bishop of Axieri by Pope Gregory XVI.

Apparently on his return from Milan he visited Constantinople, where Gregory of Nazianzus had just been appointed to the patriarchate ( 379 ).

Gregory was appointed archbishop of Dublin.

Gregory the Great ( c 540 – 604 ) who established medieval themes in the Church, in a painting by Carlo Saraceni, c. 1610, Rome.

Meanwhile Gregory XII stayed with his loyal and powerful protector, the condottiero Carlo I Malatesta, who had come to Pisa in person during the process of the council to support Gregory XII with both sets of cardinals.

A visit to the villa of Cardinal Luigi d ' Este in 1573 convinced Pope Gregory XIII to start the building of a summer residence the following year, in an area considered healthier than the Vatican Hill or Lateran: His architects were Flaminio Ponzio and Ottaviano Nonni, called Mascherino ; under Pope Sixtus V, works were continued by Domenico Fontana ( the main facade on the Piazza ) and Carlo Maderno, and by Gian Lorenzo Bernini for Pope Clement XII.

Henry IV, Holy Roman Emperor | Henry IV and Pope Gregory VII in Canossa 1077, as depicted by Carlo Emanuelle

This route passes from 25th November Avenue ( bus stages Novembru and Diacono ), Carlo Diacono Square ( bus stage Iż-Żejtun ), Mater Boni Consigli Street, Gregory Bonici Square, Republic Square ( bus stage Gwiedi ), St. Gregory Street ( bus stage Wistin ), Bishop Emmanuele Galea Street ( bus stages Isqof and Giebga ), Qadi Street ( bus stages Crieki and Huxlief ), St. Thomas Bay Road ( bus stage Girgor ), President Anton Buttigieg ( bus stages Lawrenz, Buttigieg, President and Anton ), Tal-Barrani Road ( bus stages Deheb 1, Barrani, Santu, Beland, Belt and Bulebel ).

This route passes from Tal-Barrani Road ( bus stage Deheb 1 ), Bir id-Deheb Road (( bus stages Ghadam and Haddiema ), Labour Road ( bus stage Farrugia ), 25th November Avenue ( bus stage Diacono ), Carlo Diacono Square ( bus stage Iz-Zejtun ), Mater Boni Consigli Street, Gregory Bonici Square, Republic Square ( bus stage Gwiedi ), St. Gregory Street ( bus stage Wistin ), Bishop Emmanuele Galea Street ( bus stages Isqof, Crieki and Giebga ), Qadi Street ( bus stage Huxlief ), St. Thomas Bay Road ( bus stages Girgor, Tmiem, Herba and Xaghri ), Xrobb l-Ghagin Road and President Anton Buttigieg Street ( bus stages President, Lawrenz, Anton and Buttigieg ).