Pope Gregory IX

Ugolino of Segni was the friend and protector of Saint Francis, whom he canonized in 1228, as he canonized Saint Anthony of Padua and Saint Dominic. In 1234 he published the Decretals, the great collection of Church law. He also set up the papal Inquisition to judge heresy, and struggled for years against the Emperor Frederick II.

Pontificate

2 April 1227 – 22 August 1241 (14 years, 4 months)

Born

c. 1170, Anagni

Died

29 August 1241, Rome

Preceded by

Pope Honorius III

Succeeded by

Pope Celestine IV

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