1644 papal conclave

Pope Urban VIII, born Maffeo Vincenzo Barberini, was head of the Catholic Church and ruler of the Papal States from 6 August 1623 to his death, in July 1644. As pope, he expanded the papal territory by force of arms and advantageous politicking, and was also a prominent patron of the arts and a reformer of Church missions.

Pope Innocent X, born Giovanni Battista Pamphilj, was head of the Catholic Church and ruler of the Papal States from 15 September 1644 to his death, in January 1655.

The House of Barberini is a family of the Italian nobility that rose to prominence in the 17th century Rome. Their influence peaked with the election of Cardinal Maffeo Barberini to the papal throne in 1623, as Pope Urban VIII. Their urban palace, the Palazzo Barberini, completed in 1633 by Bernini, today houses Italy's Galleria Nazionale d'Arte Antica.

The House of Pamphili was one of the papal families deeply entrenched in Catholic Church, Roman and Italian politics of the 16th and 17th centuries.

Francesco Barberini was an Italian Catholic Cardinal. The nephew of Pope Urban VIII, he benefited immensely from the nepotism practiced by his uncle. He was given various roles within the Vatican administration but his personal cultural interests, particularly in literature and the arts, meant that he became a highly significant patron. His secretary was the antiquarian Cassiano dal Pozzo who was also a discerning patron of the arts. Francesco was the elder brother of Cardinal Antonio Barberini and Taddeo Barberini who became Prince of Palestrina.

Antonio Barberini was an Italian Catholic cardinal, Archbishop of Reims, military leader, patron of the arts and a prominent member of the House of Barberini. As one of the cardinal-nephews of Pope Urban VIII and a supporter of France, he played a significant role at a number of the papal conclaves of the 17th century. With his brothers Cardinal Francesco Barberini and Taddeo Barberini he helped to shape politics, religion, art and music of 17th century Italy. He is sometimes referred to as Antonio the Younger or Antonio Barberini iuniore to distinguish him from his uncle Antonio Marcello Barberini.

A cardinal-nephew was a cardinal elevated by a pope who was that cardinal's relative. The practice of creating cardinal-nephews originated in the Middle Ages, and reached its apex during the 16th and 17th centuries. The last cardinal-nephew was named in 1689 and the practice was abolished in 1692. The word nepotism originally referred specifically to this practice, when it appeared in the English language about 1669. From the middle of the Avignon Papacy (1309–1377) until Pope Innocent XII's anti-nepotism bull, Romanum decet pontificem (1692), a pope without a cardinal-nephew was the exception to the rule. Every Renaissance pope who created cardinals appointed a relative to the College of Cardinals, and the nephew was the most common choice, although one of Alexander VI's creations was his own son.

A crown-cardinal was a cardinal protector of a Roman Catholic nation, nominated or funded by a Catholic monarch to serve as their representative within the College of Cardinals and, on occasion, to exercise the right claimed by some monarchs to veto a candidate for election to the papacy. More generally, the term may refer to any cardinal significant as a secular statesman or elevated at the request of a monarch.

Taddeo Barberini (1603–1647) was an Italian nobleman of the House of Barberini who became Prince of Palestrina and Gonfalonier of the Church; commander of the Papal Army. He was a nephew of Pope Urban VIII and brother of Cardinals Francesco Barberini and Antonio Barberini. Thanks to their uncle's famous nepotism, the brothers shaped 17th-century Italian politics, religion, art, music and architecture.

Gil de Albornoz y Espinosa, called Egidio Carillo Albornozio in Italian sources, was a Spanish Catholic Cardinal who led the Spanish delegation at the papal conclave of 1644.

Girolamo Colonna was an Italian Cardinal of the Roman Catholic Church and member of the noble Colonna family.

Giulio Cesare Sacchetti was an Italian Catholic Cardinal and was twice included in the French Court's list of acceptable candidates for the Papacy, in 1644 and 1655.

The 1655 papal conclave was convened following the death of Pope Innocent X and ended with the election of Cardinal Fabio Chigi as Alexander VII. The conclave quickly reached a deadlock, with Giulio Cesare Sacchetti receiving 33 votes throughout the conclave, but never securing enough for his own election. After several months of deliberation and negotiation, Chigi was elected Pope when Cardinal Mazarin, the leader of the French government, consented to Chigi's election at the request of Sacchetti.

The 1689 papal conclave was convened after the death of Pope Innocent XI. It led to the election of Cardinal Pietro Vito Ottoboni as Pope Alexander VIII. The conclave saw previous factions join together because they lacked numerical strength, and saw the rise of the zelanti as a political force in the election of the next pope. Ottoboni was eventually unanimously elected with the consent of the secular monarchs, becoming the first Venetian in over 200 years to be elected pope.

Carlo Rossetti (Roscetti) (1614 – 23 November 1681) was an Italian Catholic Cardinal, born of the noble Rossetti family in Ferrara. Earlier in his career he went to London as a secret nuncio on behalf of Pope Urban VIII. While in London, he was addressed as Lord Charles Rossetti and was referred to as Prince Rossetti, using his title as Italian nobility for his cover, rather than as a representative of the Roman Catholic Church to avoid persecution.

Vincenzo Maculani was an Italian Catholic Cardinal, inquisitor and military architect. He was known as a severe man, harsh and without compassion, who preferred the black cappa of his order to the brighter red he was later entitled to wear as a cardinal.

Francesco Adriano Ceva was a Catholic Cardinal from Savoy.

Giovanni Giacomo Panciroli was an Italian Catholic Cardinal and Cardinal Secretary of State.