List of Famous people born on June 21st

Lucius William O'Brien, 15th Baron Inchiquin was the England-born holder of a hereditary peerage in the Peerage of Ireland, as well as Chief of the Name of O'Brien and Prince of Thomond in the Gaelic Irish nobility.

Godefroy Maurice de La Tour d'Auvergne, Duke of Bouillon was a French nobleman and member of the House of La Tour d'Auvergne, one of the most important families in France at the time. He married Marie Anne Mancini, niece of Cardinal Mazarin and had seven children.

Major General Sir Edward Walter Clervaux Chaytor, was a farmer, and a military commander of New Zealand troops in the Boer War and the First World War.

Pope Leo IX, born Bruno of Egisheim-Dagsburg, was the bishop of Rome and ruler of the Papal States from 12 February 1049 to his death in 1054. Leo IX is widely considered the most historically significant German pope of the Middle Ages; he was instrumental in the precipitation of the Great Schism of 1054, considered the turning point in which the Catholic and Eastern Orthodox Churches formally separated. He is venerated as a saint in the Catholic Church.