Gregory X, pope of the Catholic Church (born c.1210)

Pope Gregory X, 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.

January 10 is the 10th day of the year in the Gregorian calendar; 355 days remain until the end of the year.