- 1014 23 Apr Brian Boru, High King of Ireland, is killed defeating the Vikings at Clontarf, destroying Irish unity.
- 1838 23 Apr Brunel's 'Great Western' and 'Sirius' become the first ships to cross the Atlantic by steam power alone.
- 1984 23 Apr The discovery of the HIV virus is announced by the US government in Washington.
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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