Irish civil servants Thomas Henry Burke and Lord Frederick Cavendish were stabbed to death by members of the radical Irish National Invincibles in Phoenix Park, Dublin.

Thomas Henry Burke was an Irish civil servant who served as Permanent Under Secretary at the Irish Office for many years before being assassinated during the Phoenix Park Murders on Saturday 6 May 1882. The assassination was carried out by an Irish republican organisation known as the Irish National Invincibles.

Lord Frederick Charles Cavendish was an English Liberal politician and protégé of the Prime Minister, William Ewart Gladstone. Cavendish was appointed Chief Secretary for Ireland in May 1882 but was killed along with Thomas Henry Burke in what came to be known as the Phoenix Park Murders only hours after his arrival in Dublin, a victim of the Irish National Invincibles organisation.

The Phoenix Park Murders were the fatal stabbings of Lord Frederick Cavendish and Thomas Henry Burke in Phoenix Park, Dublin, Ireland, on 6 May 1882. Cavendish was the newly appointed Chief Secretary for Ireland and Burke was the Permanent Under-Secretary, the most senior Irish civil servant. The assassination was carried out by members of a republican organisation known as the Irish National Invincibles, a more radical breakaway from the Irish Republican Brotherhood.

The Irish National Invincibles, usually known as the Invincibles, were a militant organisation based in Ireland active from 1881 to 1883. Founded as splinter group of the Irish Republican Brotherhood, the group had a more radical agenda, and was formed with an intent to target those who implemented English policies in Ireland.