Events

• May 12 - The Battle of Lewes begins (ends May 14).
• Merton College, Oxford is founded by Walter de Merton.
• James I of Aragon reconquers Orihuela.

Births

• Pope Clement V
• May 26 - Prince Koreyasu, 7th Kamakura shogun of Japan

Deaths

• October 2 - Pope Urban IV

Monarchs/Presidents

• Aragon - James I King of Aragon and count of Barcelona (reigned from 1213 to 1276)