The life and legacy of Roger Casement feature a convergence of a number of significant cross-currents of European history at the beginning of the 20th century. Born in Dublin in 1864, Casement served as a British consul in south-eastern Africa, central Africa and South America, and in his early career, was a believer in the British colonial project. In 1903, however, he was tasked by the British Government with investigating claims of abuse and mutilation in the forced harvesting of rubber in what is now the Democratic Republic of the Congo, which had in 1885 been declared a private colony of King Leopold II of Belgium. Casement’s subsequent report (1904) led to an international outcry that eventually saw Congo taken over by the Belgian state in 1908. Casement grew increasingly disillusioned with imperialism and became involved in the struggle of his native Ireland to gain independence from the British Empire. Arrested in County Kerry in April 1916 after attempting to import weapons from Germany, which was at war with Britain at the time, he was convicted of treason and sentenced to death by hanging. Initially, his international profile seemed to augur well for clemency. However, British military intelligence circulated copies of his diaries – their authenticity long disputed – which contained details of his often-paid sexual encounters with young men. Many international figures, including notably the writer Joseph Conrad, who had known Casement, deserted his cause. Casement’s homosexuality therefore was weaponised to secure his execution and to undermine his historic reputation.