Wikipedia:Selected anniversaries/June 26
June 26: Flag Day in Romania; Sunthorn Phu Day in Thailand.
- 363 - Roman Emperor Julian the Apostate was killed during the retreat from his campaign against the Sassanid Empire.
- 1409 - In trying to end the Western Schism, where Gregory XII in Rome and Benedict XIII in Avignon simultaneously claimed to be the true pope, the Council of Pisa instead ended up electing a third one, Alexander V.
- 1541 - Spanish conquistador Francisco Pizarro was assassinated in Lima by supporters of his rival Diego de Almagro's son.
- 1945 - At a conference in San Francisco, delegates from 50 nations signed a charter establishing the United Nations.
- 1976 - The CN Tower (pictured), the tallest freestanding structure on land, was opened to the public in Toronto.