Matilda's son Henry comes to England for the first time.
26 September - The Anarchy: Stephen captures Oxford, and besieges Matilda inside the castle.
December - The Anarchy: Matilda escapes from Oxford Castle across the snow in a white cape for camouflage, according to Henry of Huntingdon.
1143
The Anarchy: Geoffrey de Mandeville, a supporter of Matilda, is deprived of his castles in Essex, but subsequently captures Ely and campaigns in Cambridgeshire.
11 February - Robert of Chester completes the translation of Book of the Composition of Alchemy from Arabic to Latin. It is the first book in Europe to describe alchemy.
28 November - 24 December - The Siege of Edessa by Muslims led by Imad ad-Din Zengi eliminates the Crusader principality of Outremer, the news causing the pope to preach a new Crusade.