- 1074 9 Mar Reforming pope Gregory VII excommunicates married priests in a bid to impose strict clerical celibacy.
- 1862 9 Mar 'Monitor' and 'Merrimack' clash in the American Civil War - the first ever battle between ironclad ships.
- 1945 9 Mar United States bombers begin devastating 'firestorm raids' against Japan, which kill 250,000 people.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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