May 18, 1152 - Eleanor, Duchess of Aquitaine, married Henry Plantagenet (soon to be Henry II of England). She had been divorced only two months earlier from Louis VII of France.
May 18, 1868 - The future Tsar Nicholas II was born at Tsarskoe Selo. His reign would not end happily - he abdicated his throne and he and his family were eventually murdered.
May 18, 1804 - Napoleon Bonaparte is proclaimed Emperor of the French.