Wikipedia:Selected anniversaries/July 27
July 27: José Celso Barbosa Day in Puerto Rico.
- 1214 - Philip II of France (pictured) decisively won the Battle of Bouvines and took undisputed control of the territories of Anjou, Brittany, Maine, Normandy and the Touraine.
- 1865 - A group of Welsh settlers arrived at Chubut Valley in Argentina's Patagonia region.
- 1921 - University of Toronto researchers led by Frederick Banting announced the discovery of the hormone insulin.
- 1953 - A cease-fire was established in the Korean War.
- 1996 - Centennial Olympic Park bombing: A pipe bomb exploded during the 1996 Summer Olympics in Atlanta, Georgia, United States, killing two and injuring 111.