Wikipedia:Selected anniversaries/June 27
- 678 - Saint Agatho began his reign as Pope.
- 1358 - Republic of Ragusa founded.
- 1898 - Joshua Slocum completed the first solo circumnavigation of the globe sailing on his refitted sloop-rigged fishing boat Spray, a distance of more than 46,000 miles (74,000 km).
- 1905 - The crew of the Russian battleship Potemkin (pictured) began a mutiny against their oppressive officers.
- 1967 - The world's first electronic automated teller machine was installed in Enfield Town, London.
- 1991 - Yugoslavia invaded Slovenia, two days after the latter's declaration of independence from the former, starting the Ten-Day War.