The partition of Ireland in 1921, and the birth of Northern Ireland as a political entity, was the work of one man above all. Edward Carson, born in Dublin in 1854, was a brilliant lawyer whose cross-questioning of Oscar Wilde at his libel trial brought about Wilde's downfall. An inspiring orator and a political heavyweight at Westminster, his defence of Unionism in the years before the First World War, and of the rights of Ulster not to...