July - The King becomes mentally unstable; his cousin Richard, Duke of York acts as regent. The king will be unaware of the birth of his only son, Edward, on 13 October.
19 November - The Duke of York is reinstated as regent.
November–December - Bonville–Courtenay feud leads to continued rioting and rebellion in Devon including sacking of Exeter and the first battle of Clyst Heath (15 December).
25 February - Richard of York dismissed as regent for the second time.
April - Calais mutiny ends when wool merchants agree to back the garrison's pay.
17 August - Court moves to Coventry; Kenilworth Castle strengthened as the King's principal residence.
1457
1 January - Osmund of Salisbury (died 1099) is canonised, the last English saint created until the 20th century. His remains are translated from Old Sarum to Salisbury Cathedral on 23 July.