Thomas Becket, Archbishop of Canterbury, was murdered by four knights acting under the orders of Henry II.
The first Young Men's Christian Association (YMCA) opened in Boston.
The last major battle of the Indian Wars, at Wounded Knee Creek, took place with hundreds of Indian men, women, and children massacred.
The Constitution of Ireland, changing the Irish Free State into Eire, went into effect.
During World War II, Germany began dropping incendiary bombs on London.
Vaclav Havel was elected president of Czechoslovakia.
A peace agreement was signed, ending 36 years of conflict in Guatemala.
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