On This Day: May 26

Battle of Avarayr between Armenian rebels and the Sasanian Empire takes place. The Sasanids defeat the Armenians militarily but guaranty them freedom to openly practice Christianity.

King Edmund I of England is murdered by a thief whom he personally attacks while celebrating St Augustine's Mass Day.

King Otto I elects his 6-year-old son Otto II as heir apparent and co-ruler of the East Frankish Kingdom. He is crowned at Aachen, and placed under the tutelage of his grandmother Matilda.

Alfonso VII of León and Castile is crowned in León Cathedral as Imperator totius Hispaniae (Emperor of all of Spain).

An earthquake strikes Kamakura, Kanagawa, Japan, killing about 30,000.

William of Ockham, the Franciscan Minister-General Michael of Cesena and two other Franciscan leaders secretly leave Avignon, fearing a death sentence from Pope John XXII.

Geneva expels John Calvin and his followers from the city. Calvin lives in exile in Strasbourg for the next three years.

The Battle of Haarlemmermeer, a naval engagement in the Dutch War of Independence.

Pequot War: A combined English and Mohegan force under John Mason attacks a village in Connecticut, massacring approximately 500 Pequots.

Portuguese Restoration War: Portuguese and Spanish forces both claim victory in the Battle of Montijo.