Pope Gregory X

History
History
Priestly ordination
Date	19 March 1272
Episcopal consecration
Date	27 March 1272

History
Ordination history of; Pope Gregory X
Date
History
Priestly ordination
Date	19 March 1272
Episcopal consecration
Date	27 March 1272
Pietro Angelleli, O.P.
Episcopal succession
Bishops consecrated by Pope Gregory X as principal consecrator
Pietro Angelleli, O.P.	?? ???? 1272
Bishop Matthew of Ross	29 December 1272
Guy des Prés	5 January 1273
Saint Bonaventure, O.F.M.	11 November 1273
Giselbert von Brunkhorst	?? ???? 1274
Rudolf von Habsburg-Laufenburg	?? ???? 1274
Pierre d'Anisy	16 September 1274
Juan de Luna	5 November 1274
Amedée de Roussillon	?? ???? 1275
Siegfried de Westeburg	7 April 1275
Henri d'Isny, O.F.M.	9 October 1275

Pope Blessed

Gregory X
Pope Blessed; Gregory X
Bishop of Rome
	Fresco of Gregory X by Buonamico Buffalmacco (c. 1330)
Church	Catholic Church
Papacy began	1 September 1271
Papacy ended	10 January 1276
Predecessor	Clement IV
Successor	Innocent V
Previous post(s)	Archdeacon of Liège (1246–1271);
Orders
Ordination	19 March 1272
Consecration	27 March 1272; by John of Toledo
Personal details
Born	Teobaldo Visconti; c. 1210; Piacenza, Holy Roman Empire
Died	10 January 1276 (aged 65–66); Arezzo, Holy Roman Empire
Coat of arms
Sainthood
Feast day	10 January
Venerated in	Catholic Church
Title as Saint	Blessed
Beatified	8 July 1713; Rome, Papal States; by Pope Clement XI
Attributes	Papal vestments; Papal tiara; Crozier;
Patronage	Diocese of Arezzo; Franciscan Tertiaries;
	Other popes named Gregory

Pope Gregory X (Latin: Gregorius X; c. 1210 – 10 January 1276), born Teobaldo Visconti, was head of the Catholic Church and ruler of the Papal States from 1 September 1271 to his death and was a member of the Third Order of St. Francis. He was elected at the conclusion of a papal election that ran from 1268 to 1271, the longest papal election in the history of the Catholic Church.

He convened the Second Council of Lyon and also made new regulations in regards to the papal conclave. Gregory was beatified by Pope Clement XI in 1713 after the confirmation of his cultus.

Gregory's regulations on the conduct of the conclave, though briefly annulled by Adrian V and John XXI, remained standard practice until the 20th century. Gregory's rules were dispensed in certain extraordinary circumstances, offering greater latitude in regulating an upcoming conclave, such as by Pope Pius VI in 1798, in consideration of the occupation of Rome by the French, and by Pope Pius IX in 1878, fearing a potential Vatican invasion could prevent or dominate a papal election.