9 September – William Chillenden is elected to the Archbishopric of Canterbury.
10 November – The Lord Edward arrives in Tunis a fortnight after the Treaty of Tunis has ended fighting in the Eighth Crusade. He eventually decides to continue to the Kingdom of Jerusalem.
16 June – an attempt is made on the life of The Lord Edward at Acre; he kills the would-be assassin but receives a festering wound from a poisoned dagger.[5]
Summer – Pope Gregory X sets aside the election of William Chilldenden to the Archbishopric of Canterbury.
24 September – The Lord Edward leaves Acre for Sicily.
Merton College, Oxford, is first recorded as having a collection of books, making its Library the world's oldest in continuous daily use.[6]
1277
9 November – Treaty of Aberconwy by which Llywelyn is to retain control only of the western part of Gwynedd (although retaining the title of Prince of Wales) in return for paying homage to England; the remainder of Gwynedd is split between Edward and Dafydd ap Gruffydd (Llywelyn's brother, who has remained loyal to Edward).[2]
17 November – all Jews in England are imprisoned on suspicion of coin clipping.[8]
1279
January – Pope Nicholas III quashes the election of Robert Burnell to the Archbishopric of Canterbury.
25 January – John Peckham is enthroned as Archbishop of Canterbury against the wishes of the King.[1]
December – new silver coinage issued, including the first groats and round farthings and a new halfpenny.[1] The cutting of pennies into halves and quarters is prohibited but the practice continues for many years.[9] The Royal Mint has moved to the Tower of London by this time.[10]
The first of the Statutes of Mortmain prevents land from passing into possession of the church.[2]
Itinerant royal judges are ordered to inquire into confederacies against justice, thus effectively making conspiracy a crime.[11]
^Peck, C. Wilson (1960). English Copper, Tin and Bronze Coins in the British Museum 1558–1958. London: Trustees of the British Museum. p. 2. OCLC906173180.