1916: Knighted Diplomat Hanged for Treason After Failed Easter Rising Mission

Sir Roger Casement, the British consul who had been honoured for exposing colonial atrocities in the Congo and Peru, was hanged at Pentonville Prison in London on 3 August 1916. Once celebrated as the 'father of twentieth-century human rights investigations', he had spent the war years seeking German military support for the Easter Rising before being arrested on the Kerry coast just days before the uprising began.

Stripped of his knighthood, he was tried and convicted of high treason. During and after the trial, British intelligence circulated typescripts of private journals, said to be in Casement's hand, that detailed homosexual activity. The material, illegal under the laws of the time, was used to undermine calls for clemency. He was executed at 49, and the authenticity of those diaries has been disputed by scholars ever since.

Portrait of Sir Roger Casement in formal attire
Portrait of Sir Roger Casement in formal attire

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