Wikipedia:Selected anniversaries/April 30
April 30: Queen's Day in the Netherlands; Walpurgis Night in various European countries; Reunification Day in Vietnam
- 313 – Roman Emperor Licinius unified the eastern half of the empire under his rule.
- 711 – Umayyad troops led by Tariq ibn Ziyad landed at Gibraltar, beginning their conquest of Hispania.
- 1789 – George Washington (pictured) took the oath as the first President of the United States of America at Federal Hall in New York City.
- 1945 – World War II: As Allied forces were closing in on Berlin, Adolf Hitler and Eva Braun committed suicide in the Führerbunker after being married for one day.
- 1948 – 21 countries signed a charter in Bogotá, Colombia establishing the Organization of American States.
- 1975 – North Vietnamese troops captured Saigon, ending the Vietnam War with the unconditional surrender of South Vietnam.
- 1993 – CERN announced that the World Wide Web would be free to everyone.