Gascon leaders travel to England to put their case against Simon de Montfort, who eventually resigns.[3]
1253
6 August – Expedition by Henry III to Gascony to repel a rumoured invasion from Castile.[3]Eleanor of Provence is regent and de facto Lord Chancellor in England during her husband's absence.
August – A gold penny is introduced, but swiftly withdrawn when its bullion value proves greater than its twenty pence face value.[3]
c. September – 1257 Samalas eruption: Mount Samalas volcano erupts on Lombok Island in Indonesia; the resultant climatic changes combine with a second successive poor grain harvest this summer in Britain to produce famine, killing an estimated 17,000 in Britain (15,000 in London).[7][8]
Brothers of Penitence (Fratres Saccati, 'Brothers of the Sack') first settle in England, in London.[9]