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16 April 2014 Last updated at 15:58

At the outbreak of the First World War three cousins reigned over Europe's greatest powersRoyal Cousins at War

See images of the cousins who reigned over Europe's greatest powers in 1914

An illustration of a WW1 trenchWorld War One resources for schools

Discover primary and secondary school resources for teachers and students

World War One At Home

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