Roger Casement endured a horrible death, disgraced and sordid. But most of all, it was unfair.

The executions of 15 of the leaders of the 1916 Rising were carried out between May 3rd and May 12th. Among the executed was James Connolly.

Dying of wounds suffered during the rebellion, he was shot while tied to a chair.

Ireland was shocked by the deaths, particularly his, as was the world. Largely unheeded by many Irish people, who regarded the rebellion as a skirmish staged by a small group of revolutionaries, the executions raised awareness of the bold intent behind the idealism.

Outrage increased and the republican dead became martyrs.

Yet there was a 16th execution and it took place 100 years today. Casement did not face a firing squad.

There was no glory and no pathos, although Sir Arthur Conan Doyle, WB Yeats and George Bernard Shaw had tried to intervene.

Casement died aged 51, hanged as a traitor at Pentonville Prison in London.

The British government decided to have his anus and lower bowel examined for evidence of his homosexuality. His sexual orientation seemed to have a higher priority than his politics.

Somehow, his campaigning humanitarian work was forgotten as had his distinguished career in the British colonial service which he joined in 1892.

His 60-page report on the Congo published in 1905 detailed the inhuman treatment inflicted on native workers in the Belgian Congo under the harsh rule of King Leopold II.

Casement was later promoted to consular general and posted to Rio de Janeiro. There he investigated the conditions prevailing in the Peruvian rubber plantations along the Putumayo river and their impact on the Putumayo tribe.

That report caused an international sensation on publication in 1912. Casement had been knighted the previous year for his achievements.

In August 1913 he retired from the service which he had previously resigned from in 1904 and then rejoined, encountering some official reluctance because of his personality, in 1906.

But this second leave-taking was final. His disillusionment was complete, as was his intention to join the Irish Volunteers, which he did in November 1913.

Irony undercuts Casement’s life: he was clever, impatient and unsettled. His restlessness made him subject to boredom and depression.

He had an obvious talent: a fearless curiosity which made him a natural investigator and a good reporter.

His writings on Africa prove excellent reportage; he saw, assessed and recorded with balance, not sensationalism.

Vulnerable figure

It is easy to romanticise him, but the fact is, he was a romantic. He was also a maverick, an Anglo-Irish Lawrence of Arabia.

Unlike TE Lawrence, also famed for an erratic personality, Casement did not die in a dramatic accident, as Lawrence would in 1935, following a motorbike crash.

Also, for all the ambivalence surrounding Lawrence’s sexuality, he was more usually regarded as asexual.

For Casement the existence of the Black Diaries, which may or may not have been written by him, in the form of five notebooks chronicling sexual encounters, the material proved damning and was used to condemn him. Were they forged? Why not?

A similar tactic had been used to destroy Charles Stewart Parnell, another victim of his private life – in his case an adulterous relationship which did end in marriage.

Casement was not a traitor, he was an embarrassment, and not only to the British government, as he also exposed the evils of European colonialism.

He was born in Sandycove, Dublin on September 1st, 1864, the youngest of four children.

His Church of Ireland father, also Roger, was a retired army officer, while his Catholic mother, Anne, had each of her babies secretly baptised into her faith. Money was scarce. After her early death in 1873, the Casement family moved to Co Antrim.

Casement attended Ballymena Academy and developed a love for Rathlin Island; the time he spent exploring it may have influenced his later love of wandering through the more dense jungle and riverscapes of Africa and South America.

When his father suddenly died in 1877, Casement was only 13 and dependent on relatives in Co Antrim and Liverpool.

He grew up quickly and began working as an office clerk in a shipping company in Liverpool when he was 15.

Not yet 20, he set off for Africa as a ship’s purser. As mentioned, he joined the British colonial service in 1892.

Initially opposed to the Boers for their treatment of the natives, he was later to denounce the British treatment of the Boer community.

His experiences soon opened his eyes and he met a young Russian-Polish seaman, just more than three years his junior. In common with Casement, Konrad Korzeniowski’s parents had died early.

The seaman would later become famous as the modernist writer Joseph Conrad.

Irish republicanism

They were friends but when Casement needed his support, Conrad – who had become a British subject in 1886 and who was wary of jeopardising his life in Britain – refused to plead on his behalf.

On leaving consular service in 1913, Casement became involved in Irish republicanism, helping Eoin O’Neill to form the Irish Volunteers and eventually travelling to Germany to seek support and weapons for an armed rebellion against British rule.

On the eve of the Rising, aware that the German support was inadequate, Casement returned to Ireland by submarine and landed at Banna Strand, Tralee, Co Kerry. It all ended in a farce, with him convinced the rebellion should be stopped.

Weakened by malaria, he was arrested and taken to England. A four-day trial ended with a guilty verdict, famously compounded by a comma in a law dating from 1351.

As Oscar Wilde had been before him, Casement was betrayed by his sexuality and a dangerous candour. After his hanging, his body was placed in quicklime and he became a forgotten man.

In 1965 the Irish government had Casement’s remains returned to Ireland and reinterred following a State funeral attended by then president Éamon de Valera, the only 1916 leader to survive.