Pope Leo IV was the bishop of Rome and leader of the Papal States from 10 April 847 to his death in 855. He is remembered for repairing Roman churches that had been damaged during the Arab raid against Rome, and for building the Leonine Wall around Vatican Hill to protect the city. Pope Leo organized a league of Italian cities who fought and won the sea Battle of Ostia against the Saracens.
Christian feast day: Pope Leo IV
On July 17, in the year 0, Christian feast day: Pope Leo IV. This event is recorded as a Holidays event in the history of July 17, a notable event in this corner of history.
Key Facts
- This event took place on July 17, 0 (AD era).
- It is categorised as a Holidays event in recorded history.
- Referenced in 1 Wikipedia article.
- Wikipedia source last updated on 1 July 2026.
On This Date in History
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