Joseph Mary Plunkett 21 Nov. 1887 –4 May 1916) was an Irish nationalist, poet and leader of the 1916 Easter rising. His father,George Noble Plunkett, was a papal count and curator of the National Museum, although his father's cousin, a Protestant named Horace Plunkett was a Unionist who sought to reconcile both sides, but instead witnessed his own home burned down during the Anglo Irish War.

Born in Dublin, at a young age Plunkett was stricken with tuberculosis, and spent part of his youth in the warmer climates of the Mediterranean and north Africa. He studied at the Jesuit Colleges, Belverdere college in Dublin and Stonyhurst  College, in Lancashire, and acquired some military knowledge from the Officers' Training Corps there.

Throughout his life, Joseph Plunkett took an active interest in Irish heritage and the Irish language, and also studied Esperanto. He joined that Gaelic league and took on as a tutor Thomas McDonagh with whom he formed a lifelong friendship. The two were both poets with an interest in theater, and both were early members of the Irish Volinteers joining their provisional committee. Plunkett's interest in Irish nationalism spread throughout his family, notably to his younger brothers George and John, as well as his father, who allowed his property in Kimmage south Dublin to be used as a training camp for young men who wished to escape conscription in England during world war 1, Men there were instead trained to fight for Ireland.

Sometime in 1915 Joseph Plunkett joined the Irish republican brotherhood, and soon after was sent to Germany to meet with Roger Casement who was negotiating with the German government on behalf of Ireland. Casement's role as emissary was self-appointed, and as he was not a member of the IRB, that organization's leadership wished to have one of their own contact Germany to negotiate German aid for an uprising the following year. He was seeking (but not limiting himself to) a shipment of arms. Casement, on the other hand, spent most of his energies recruiting Irish prisoners of war in Germany to form a brigade to fight instead for Ireland. Most nationalists in Ireland saw this as a fruitless endeavor, and preferred to seek weapons. Plunkett successfully got a promise of a German arms shipment to coincide with the rising.

Plunkett was one of the original members of the IRB Military Committee that was responsible for planning the rising, and it was largely his plan that was followed. As such he may be held partially responsible for the military disaster that ensued, though one should realize that in the circumstances any plan was bound to fail. Shortly before the rising was to begin, Plunkett was hospitalized following a turn for the worse in his health. He had an operation on his neck glands days before Easter and had to struggle out of bed to take part in what was to follow. Still bandaged, he took his place in the general post office with several other of the rising's leaders such as Patrick Pearse and Tom Clarke though his health prevented him from being terribly active. His energetic aide de camp was Michael Collins

Following the surrender Plunkett was held in Kilmainham gaol and faced a court martial Hours before his excecution by firing squad at the age of 28, he was married in the prison chapel to his sweetheart Grace Gifford, a Protestant convert to Catholicism, whose sister, Muriel, had years before also converted and married his best friend Thomas MacDonagh, who was also executed for his role in the Easter Rising. The main railway station in Waterford City is named after him.

http://en.wikipedia.org/wiki/Joseph_Plunkett