1373
Year 1373 was a common year starting on Saturday of the Julian calendar.
Events
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.
- April 28 - Hundred Years' War: The French re-capture most of Brittany from the English, but are unable to take Brest.
- May 13 - English anchoress Dame Julian of Norwich receives the sixteen Revelations of Divine Love.
- June 16 - The Anglo-Portuguese Treaty is signed in London, and is the oldest active treaty in the world.
- August - Hundred Years' War: John of Gaunt launches a new invasion of France.
- November? - Philip II, Prince of Taranto hands over the rule of Achaea to his cousin, Joanna I of Naples.
Date unknown
- Louis I of Hungary takes Severin again, but the Vlachs will recover it in 1376–1377.
- 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.
- Constantine IV, ruler of the Armenian Kingdom of Cilicia, is assassinated; he is succeeded by his distant cousin Leo V.
- The death of Sultan Muhammad III ibn Abd al-Aziz begins a period of political instability in Morocco.
- The city of Phnom Penh is founded.
- Bristol is made a county corporate, the first town in the Kingdom of England outside London to be granted this status.
- A city wall is built around Lisbon, Portugal to resist invasion by Castile.
- 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.