The Diamond Jubilee reference article from the English Wikipedia on 24-Apr-2004
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Diamond Jubilee

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A Diamond Jubilee is a celebration held to mark a 60th anniversary.

In the United Kingdom, a Diamond Jubilee is held in a monarch's 60th year. Queen Victoria celebrated the jubilee in 1897, and should she still be on the throne at the time, Queen Elizabeth II's diamond jubilee will be in 2012.

See also