September 14: Feast of the Cross (Christianity)
- 81 – Domitian became the last Flavian emperor of Rome, succeeding his brother Titus.
- 1752 – In adopting the Gregorian calendar under the terms of the Calendar (New Style) Act 1750, the British Empireskipped eleven days: (September 2 was followed directly bySeptember 14).
- 1901 – Theodore Roosevelt became President of the United States at age 42, the youngest person ever to do so, eight days after William McKinley was fatally wounded in Buffalo, New York.
- 1911 – Prime Minister of Russia Pyotr Stolypin (pictured) was mortally shot at the Kiev Opera House.
- 2003 – Kumba Ialá, the President of Guinea-Bissau, was deposed in a bloodless coup.