1373

1373 (MCCCLXXIII) was a common year starting on Saturday of the Julian calendar, the 1373rd year of the Common Era (CE) and Anno Domini (AD) designations, the 373rd year of the 2nd millennium, the 73rd year of the 14th century, and the 4th year of the 1370s decade. As of the start of 1373, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.

• March 24 – The Treaty of Santarém is signed between D. Fernando of Portugal and Henrique II of Castile, ending the second war between the two countries.
• May 13 – Julian of Norwich receives the sixteen Revelations of Divine Love.

• Bristol is made an independent county.
• The Anglo-Portuguese alliance is signed (currently the oldest active treaty in the world).
• The city of Phnom Penh (now the capital city of Cambodia) is founded.
• Philip II of Taranto hands over the rule of Achaea (now southern Greece) to his cousin, Joanna I of Naples.
• Leo VI succeeds his distant cousin, Constantine VI, as King of Armenian Cilicia (now southern Turkey).
• 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.

• March 29 – Marie of Alencon, French princess (d. 1417)
• June 23 – Queen Joan II of Naples (d. 1435)
• September 22 – Thomas le Despenser, 1st Earl of Gloucester (d. 1400)
• date unknown
  • Edward of Norwich, 2nd Duke of York (d. 1415)
  • Margery Kempe, writer of the first autobiography in English

• January 16 – Humphrey de Bohun, 7th Earl of Hereford (b. 1342)
• February – Ibn Kathir, Islamic scholar (b. 1301)
• July 23 – Saint Birgitta, Swedish saint (b. 1303)
• November 3 – Jeanne de Valois, Queen of Navarre (b. 1343)
• December 7 – Rafał z Tarnowa, Polish nobleman (b. c. 1330)
• date unknown
  • Constantine VI of Armenia (assassinated)
  • Robert le Coq, French bishop and councillor