Boniface VIII in the context of "Simony"

Papal primacy, also known as the primacy of the bishop of Rome, is an ecclesiological doctrine in the Catholic Church concerning the respect and authority that is due to the pope from other bishops and their episcopal sees. While the doctrine is accepted at a fundamental level by both the Catholic Church (Eastern and Western) and the Eastern Orthodox Church, the two disagree on the nature of primacy.

English academic and Catholic priest Aidan Nichols wrote that "at root, only one issue of substance divides the Eastern Orthodox and the Catholic Churches, and that is the issue of the primacy." French Eastern Orthodox researcher Jean-Claude Larchet wrote that, together with the Filioque controversy, differences in interpretation of this doctrine have been and remain the primary causes of schism between the Catholic Church and the Eastern Orthodox Church. In the Eastern Orthodox churches, some understand the primacy of the bishop of Rome to be merely one of greater honour, regarding him as primus inter pares ("first among equals"), without effective power over other churches. A prominent 20th century Eastern Orthodox Christian theologian, Fr. Alexander Schmemann, envisioned a primacy that sums up rather than rules over: "Primacy is power, but as power it is not different from the power of a bishop in each church. It is not a higher power but indeed the same power, only expressed, manifested, and realized by one."

James II (Catalan: Jaume II; Aragonese: Chaime II; 10 April 1267 – 2 or 5 November 1327), called the Just, was the King of Aragon and Valencia and Count of Barcelona from 1291 to 1327. He was also the King of Sicily (as James I) from 1285 to 1295 and the King of Majorca from 1291 to 1298. From 1297 he was nominally the King of Sardinia and Corsica, but he only acquired the island of Sardinia by conquest in 1324. His full title for the last three decades of his reign was "James, by the grace of God, king of Aragon, Valencia, Sardinia and Corsica, and count of Barcelona" (Latin: Iacobus Dei gratia rex Aragonum, Valencie, Sardinie, et Corsice ac comes Barchinone).

Born at Valencia, James was the second son of Peter III of Aragon and Constance of Sicily. He succeeded his father in Sicily in 1285 and his elder brother Alfonso III in Aragon and the rest of the Spanish territories, including Majorca, in 1291. In 1295 he was forced to cede Sicily to the papacy, after which it was seized by his younger brother, Frederick III, in 1296. Two years later rom Pope Boniface VIII returned the island to the king of Majorca along with rights to Sardinia and Corsica. On 20 January 1296, Boniface issued the bull Redemptor mundi granting James the titles of Standard-bearer, Captain General and Admiral of the Roman church.

Pope Celestine V (Latin: Caelestinus V; 1209/1210 or 1215 – 19 May 1296), born Pietro Angelerio (according to some sources Angelario, Angelieri, Angelliero, or Angeleri), also known as Pietro da Morrone, Peter of Morrone, and Peter Celestine, was head of the Catholic Church and ruler of the Papal States for five months from 5 July to 13 December 1294, when he resigned. He was also a monk and hermit who founded the order of the Celestines as a branch of the Benedictine order.

He was elected pope in the Catholic Church's last non-conclave papal election, ending a two-year impasse. Among the few edicts of his to remain in force is the confirmation of the right of the pope to resign; nearly all of his other official acts were annulled by his successor, Boniface VIII. On 13 December 1294, a week after issuing the decree, Celestine resigned, stating his desire to return to his humble, pre-papal life. He was subsequently imprisoned by Boniface in the castle of Fumone in the Lazio region, in order to prevent his potential installation as antipope. He died in prison on 19 May 1296.