49 BC – Julius Caesar crosses the Rubicon, signaling the start of civil war.
1645 – Archbishop William Laud is beheaded at the Tower of London.
1776 – Thomas Paine publishes Common Sense.
1810 – Napoleon Bonaparte divorces his first wife Josephine.
1920 – The Treaty of Versailles takes effect, officially ending World War I.
1946 – The first General Assembly of the United Nations opens in London. 51 nations are represented.
1984 – The United States and Vatican City establish full diplomatic relations after 117 years.