Pope Gregory XV (died 1623)

Pope Gregory XV, born Alessandro Ludovisi, was the head of the Catholic Church and ruler of the Papal States from 9 February 1621 until his death in 1623. He is notable for founding the Congregation for the Propagation of the Faith, an organization tasked with overseeing the spread of Catholicism and missionary work. Gregory XV was also responsible for the canonization of Saints Ignatius of Loyola, Francis Xavier, Teresa of Ávila, and Philip Neri, which solidified his commitment to the Counter-Reformation.

January 9 is the ninth day of the year in the Gregorian calendar; 356 days remain until the end of the year.