1373

Year 1373 (MCCCLXXIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

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 (modern-day southern Greece) 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 (modern-day southern Turkey), 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 (modern-day capital city of Cambodia) 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.

Births

 * March 29 – Marie d'Alençon, French princess (d. 1417)
 * June 25 – Queen Joanna 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

Deaths

 * January 16 – Humphrey de Bohun, 7th Earl of Hereford (b. 1342)
 * February – Ibn Kathir, Mamluk 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 of Tarnów, Polish nobleman (b. c. 1330)
 * date unknown
 * Constantine IV, King of Armenia (assassinated)
 * Robert le Coq, French bishop and councillor
 * Tiphaine Raguenel, Breton astrologer (b. c. 1335)