On This Day
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Pope Gregory IX excommunicates German emperor Frederick II

Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241.

Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241. He is known for issuing the Decretales and instituting the Papal Inquisition, in response to the failures of the episcopal inquisitions established during the time of Pope Lucius III, by means of the papal bull Ad abolendam, issued in 1184.

He worked initially as a cardinal, and after becoming the successor of Honorius III, he fully inherited the traditions of Gregory VII and of his own cousin Innocent III, and zealously continued their policy of papal supremacy.

Historical Significance

Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241.

Events Before

  1. King of Scotland, Alexander II (23) marries Joan of England, sister of Henry III, a day before her 11th birthday at York

    King of Scotland, Alexander II (23) marries Joan of England, sister of Henry III, a day before her 11th birthday at York Minister

  2. Battle of the Kalka River: Mongol force led by Jebei and Subedei defeat a Russian alliance, after feigning their retreat

    Battle of the Kalka River: Mongol force led by Jebei and Subedei defeat a Russian alliance, after feigning their retreat, leading to the death of 20,000 Russians

  3. Louis VIII becomes King of France upon the death of his father, Philip II

    Philip II (21 August 1165 – 14 July 1223), also known as Philip Augustus (French: Philippe Auguste), was King of France from 1180 to 1223.

  4. Francis of Assisi is afflicted with stigmata after a vision while praying on Mount La Verna

    Francis of Assisi is afflicted with stigmata after a vision while praying on Mount La Verna

  5. The Roman Catholic practice of public adoration of the Blessed Sacrament outside of Mass spreads from monasteries to par

    The Roman Catholic practice of public adoration of the Blessed Sacrament outside of Mass spreads from monasteries to parishes

Events After

  1. Wu MeKuan, a collection of 48 Zen koans, is compiled in China

    Wu MeKuan, a collection of 48 Zen koans, is compiled in China

  2. Holy Roman Emperor Frederick II crowns himself King of Jerusalem

    Frederick II (Italian: Federico, Sicilian: Fidiricu, German: Friedrich, Latin: Fridericus; 26 December 1194 – 13 December 1250) was King of Sicily from 1198, King of Germany from 1212, King of Italy...

  3. Queen Blanche of Castile & Earl Raymond VII of Toulouse sign peace

    Blanche of Castile (Spanish: Blanca de Castilla; French: Blanche de Castille; 4 March 1188 – 27 November 1252) was Queen of France by marriage to Louis VIII.

  4. Aragonese army led by James I of Aragon disembarks at Santa Ponça, Majorca, to conquer the island

    Aragonese army led by James I of Aragon disembarks at Santa Ponça, Majorca, to conquer the island

  5. Otto II becomes earl of Gelre

    Otto II becomes earl of Gelre

More from the 1220s

King of Scotland, Alexander II (23) marries Joan of England, sister of Henry III, a day before her 11th birthday at York

King of Scotland, Alexander II (23) marries Joan of England, sister of Henry III, a day before her 11th birthday at York Minister

Francis of Assisi is afflicted with stigmata after a vision while praying on Mount La Verna

Francis of Assisi is afflicted with stigmata after a vision while praying on Mount La Verna

Ferrand, Count of Flanders, freed from the Louvre after being held prisoner for 12 years by the French

Ferrand, Count of Flanders, freed from the Louvre after being held prisoner for 12 years by the French

Holy Roman Emperor Frederick II crowns himself King of Jerusalem

Frederick II (Italian: Federico, Sicilian: Fidiricu, German: Friedrich, Latin: Fridericus; 26 December 1194 – 13 December 1250) was King of Sicily from 1198, King of Germany from 1212, King of Italy...

Frequently Asked Questions

What happened on September 29, 1227?
Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241. He is known for issuing the Decretales and instituting the Papal Inquisition, in response to the failures of the episcopal inquisitions established during the time of Pope Lucius III, by means of the papal bull Ad abolendam, issued in 1184. He worked initially as a cardinal, and after becoming the successor of Honorius III, he fully inherited the traditions of Gregory VII and of his own cousin Innocent III, and zealously continued their policy of papal supremacy.
Why is Pope Gregory IX excommunicates German emperor Frederick II significant?
Pope Gregory IX (Latin: Gregorius IX; born Ugolino di Conti; 1145 – 22 August 1241) was head of the Catholic Church and the ruler of the Papal States from 19 March 1227 until his death in 1241.

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September 29 in HistoryYear 1227