battle, notable, medieval

Battle of Ostia

Battle of Ostia was a battle fought in AD 849 at Ostia, in what is now Italy. The recorded result: Christian League victory. Recorded strength: Unknown against Unknown.

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Record

Date	AD 849 (year precision)
Place	Ostia, Italy 41.750N, 12.283E
Kind	Battle, medieval
Result	Christian League victory
Belligerents	Christian League: Papal States; Flag of the Greek Orthodox Church.svg Byzantine Empire; Flag of Gaeta (10th century).svg Duchy of Gaeta; Flag of the Republic of Amalfi.svg Duchy of Amalfi; Double-headed_eagle_of_the_Greek_Orthodox_Church.svg Duchy of Naples	Muslim fleet
Commanders	Caesar of Naples; Pope Leo IV	Unknown
Strength	Unknown	Unknown
Casualties and losses	Minimal	Heavy

The recorded site, with the nearest other engagements in the atlas. Present-day coastlines, rivers and borders; towns from Natural Earth.

Nearest engagements

Siege of Ostia 1497, 1.4 km
Sack of Rome, 1527 1527, 20 km
Stand of the Swiss Guard 1527, 20 km
German occupation of Rome 1943, 21 km
Battle of the Janiculum 476 BC, 22 km

Battle of Ostia is one of 105 engagements of the 9th century in the atlas and one of 626 in present-day Italy.

Sources

Identity, coordinates, dates and the war from Wikidata Q1268954, released under CC0. Result, belligerents, commanders, strength and casualties from the infobox of the English Wikipedia article Battle of Ostia, revision 1370452409, read 2026-11-14, licensed CC BY-SA 4.0; the article's text is not reproduced here. Present-day country and state from Natural Earth. Dates before 1582 follow the Julian calendar as recorded.