1373

January–December

• March 24 - The Treaty of Santarém is signed between Ferdinand I of Portugal and Henry II of Castile, ending the second war between the two countries.
• May 13 - Julian of Norwich receives the sixteen Revelations of Divine Love.
• June 16 - The Anglo-Portuguese alliance is signed.

  Date unknown

• Louis I of Hungary takes Severin again, but the Vlachs will recover it in 1376–1377.
• Bristol in England is made an independent county.
• The city of Phnom Penh is founded.
• Philip II, Prince of Taranto hands over the rule of Achaea to his cousin, Joanna I of Naples.
• Leo V succeeds his distant cousin, Constantine IV, as King of Armenian Cilicia.
• A city wall is built around Lisbon, Portugal to resist invasion by Castile.
• Tran Kinh succeeds Tran Phu as King of Vietnam.
• Byzantine co-emperor Andronikos IV Palaiologos rebels against his father, John V Palaiologos, for agreeing to let Constantinople become a vassal of the Ottoman Empire. After the rebellion fails, Ottoman Emperor Murad I commands John V Palaiologos to blind his son.
• The death of Sultan Muhammad as-Said begins a period of political instability in Morocco.
• Merton College Library is built in Oxford, England.
• The Adina Mosque is built in Bengal.
• The Chinese emperor of the Ming Dynasty, the Hongwu Emperor, suspends the traditional civil service examination system, after complaining that the 120 new jinshi degree-holders are too incompetent to hold office; he instead relies solely upon a system of recommendations, until the civil service exams are reinstated in 1384.