Papacy began
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12 February 1049
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Papacy ended
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19 April 1054
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Predecessor
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Successor
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| Birth name | Bruno von Eguisheim-Dagsburg |
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| Born | 21 June 1002 Eguisheim, Alsace, Duchy of Swabia, Holy Roman Empire |
| Died | 19 April 1054 (aged 51) Rome, Papal States, Holy Roman Empire |
| Sainthood | |
| Feast day | 19 April |
Leo IX (21 June 1002 – 19 April 1054), born Bruno of Egisheim-Dagsburg, was Pope from 12 February 1049 to his death. He was a German aristocrat and a powerful secular ruler of central Italy while holding the papacy. He is regarded as a saint by the Roman Catholic Church, his feast daycelebrated on 19 April. Leo IX is widely considered the most historically significant German Pope of the Middle Ages. His citing of the Donation of Constantine in a letter to the Patriarch of Constantinople brought about the Great Schism between the Catholic and Orthodox churches.