John XXIII (Pisan)

John XXIII (Pisan)
Name	John XXIII (Pisan)
Birth name	Baldassarre Cossa
Birth date	c. 1365
Birth place	near Naples, Kingdom of Naples
Death date	December 22, 1419
Death place	Florence, Republic of Florence
Occupation	Cardinal, Antipope
Known for	Leadership of the Pisan obedience during the Western Schism; role in the Council of Constance

John XXIII (Pisan) Baldassarre Cossa, known to history as the Pisan claimant John XXIII, was an Italian cardinal who became antipope during the late medieval Western Schism. His career intersected with key figures and institutions of late 14th- and early 15th-century Christendom, including the Kingdom of Naples, the Avignon Papacy, the Holy Roman Empire, and the Council of Constance.

Early life and background

Baldassarre Cossa was born near Naples in the mid-14th century into a family linked to the Kingdom of Naples and the Neapolitan aristocracy; his rise was shaped by patrons such as Pope Boniface IX, Pope Innocent VII, and Pope Gregory XII. He entered ecclesiastical service during the turbulent aftermath of the Western Schism, advancing through positions associated with the Roman Curia, the College of Cardinals, and the papal chancery under the influence of Neapolitan and Roman factions including allies of King Ladislaus of Naples and administrators from the Kingdom of Sicily. Cossa's early career connected him to networks involving Cardinal Francesco Zabarella, Pietro Filargo (Alexander V), and diplomats engaged with the Council of Pisa (1409).

Election as Pope (Antipope John XXIII)

Following the convocation of the Council of Pisa (1409), which sought to end the schism between the obediences of Pope Gregory XII in Rome and the Avignon Papacy claimant Benedict XIII (Avignon), Cossa emerged as a central figure in the Pisan faction. The council declared both rival pontiffs deposed and elected Pietro Filargo as Pope Alexander V; upon Alexander V's death, the council elevated Cossa to the papal office, whereupon he took the name John XXIII. His election was contested by adherents of Gregory XII and Benedict XIII and by sovereigns such as Charles VI of France and Henry IV of England, who were affected by the competing obediences.

Papacy during the Western Schism

As the Pisan pope, John XXIII navigated a divided Christendom that included the Kingdom of France, the Kingdom of England, the Holy Roman Empire, the Crown of Aragon, and principalities of the Italian city-states such as Florence, Venice, and Milan. He attempted to assert legitimacy through diplomatic missions, appointments to the College of Cardinals, and alliances with secular rulers including Sigismund, Holy Roman Emperor-elect, and military leaders connected to Ladislaus of Naples. John XXIII's pontificate was marked by negotiations over canonical elections, contested benefices, and the patronage networks of families like the Medici and the Orsini, as well as interventions by figures such as Pisans and Romans in local ecclesiastical affairs.

Relations with other claimants and European rulers

John XXIII's relations with the other claimants—Gregory XII in Rome and Benedict XIII in Avignon—were adversarial yet mediated by efforts at conciliar settlement spearheaded by rulers and envoys from France, England, and the Holy Roman Empire. His diplomatic posture involved frequent interaction with deputies from the Duchy of Burgundy, the Kingdom of Castile, and the Kingdom of Aragon, and negotiations with councils and synods convened by Italian communes like Siena and Pistoia. He relied on the support of Sigismund to pursue a general council, while concurrently facing opposition from cardinals loyal to Gregory XII and Benedict XIII and from military interventions mounted by partisans of Ladislaus of Naples.

Council of Constance and deposition

In response to calls for resolution, John XXIII convened or supported plans for a general council that culminated in the Council of Constance (1414–1418), where representatives of the Holy Roman Empire, the Kingdom of England, the Kingdom of France, and the Kingdom of Hungary sought unity. At Constance, debates among conciliarists and supporters of papal primacy involved lawyers and theologians such as Jean Gerson, Ulrich Zwingli (earlier precursors of reform), and jurists from the University of Bologna and the University of Paris. Facing charges of maladministration and scandal, John XXIII fled Constance but was captured by forces of Sigismund; the council declared him deposed in 1415. The council later examined Gregory XII and Benedict XIII, ultimately facilitating election of Pope Martin V and ending the schism.

Later life and legacy

After deposition, Baldassarre Cossa was confined by the council and later reconciled to the papal court under Martin V, receiving a cardinalate or benefices as part of his rehabilitation, and he spent his final years in Florence and other Italian courts. His later life intersected with artistic and cultural patronage in the early Renaissance milieu of Florence and the diplomatic realignments following the end of the schism, including shifts involving the Republic of Venice and the Duchy of Milan. Cossa's trajectory from cardinal to antipope to rehabilitated churchman influenced contemporary perceptions of ecclesiastical authority and the mechanisms of conciliar adjudication.

Historical assessment and historiography

Historians have debated John XXIII's role in the ending of the Western Schism, assessing him variously as opportunistic, pragmatic, or an instrument of conciliar reform. Scholarship engages primary sources from the Vatican Archives, chronicles by Flavio Biondo and Aeneas Sylvius Piccolomini (Pope Pius II), and legal analyses tied to the doctrines of conciliarism formulated at Constance and earlier councils like Constance and the Council of Pisa. Modern historians situate Cossa within studies of late medieval papal politics, Neapolitan dynastic ambitions, and the transition toward Renaissance statecraft, linking his career to broader currents involving the Conciliar Movement, the Hundred Years' War, and the diplomatic practices of late medieval Europe.

Category:People of the Western Schism Category:Antipopes Category:14th-century Italian people Category:15th-century Italian people