- Before May - Second Barons' War , a Civil War In England , begins.
- May 12 to May 14 - The Battle Of Lewes of the Second Barons' War is fought between Simon De Montfort, 6th Earl Of Leicester and King Henry III Of England in Sussex . By the end of the battle, de Montfort's forces capture both King Henry and his brother, future King Edward I , making de Montfort the "uncrowned king of England " for 15 months before Edward escapes captivity and recaptures the throne.
- June 18 - The Parliament Of Ireland meets at Castledermot in County Kildare , the first definitively known meeting of this Irish Legislature .
- In Spain , King James I Of Aragon Reconquers the cities of Orihuela in Alicante and Elx in Valencia from the Moors , ending over 500 years of Islam ic rule.
- The Thuringian War Of Succession ends.
- The state of Hesse gains its independence from Thuringia and becomes a free state of the Holy Roman Empire .
- In the Peerage Of England , the title Baron De Ros , the oldest continuously held peerage title in England, is created by Writ Of Summons .
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