A document written in this city established a 24-member council which Simon de Montfort intended to use to check Henry III's royal power; those namesake "Provisions" helped kick off the Barons' Wars.
During The Anarchy, Empress Matilda escaped siege of this city's castle by walking across a frozen river. In Anglo-Saxon times, this town was at a strategic point between Wessex and Mercia. Historians believe that Geoffrey of Monmouth wrote down his Arthurian legends in this city's chapel. A document written in this city established a 24-member council which Simon de Montfort intended to use to check Henry III's royal power; those namesake "Provisions" helped kick off the Barons' Wars. For 10 points, name this city where students from Merton and Balliol colleges got into early "town-gown" riots, home to the oldest university in Britain.
During The Anarchy, Empress Matilda escaped siege of this city's castle by walking across a frozen river.
Oxford [or Oxon]