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Year 1389 (MCCCLXXXIX) was a common year starting on Friday (link will display full calendar) of the Julian calendar.
- Mircea I of Wallachia and Polish king Władysław II Jagiełło sign their first treaty, to protect their countries against Ottoman expansion.
- Goryeo Revolution in Korea (1388–1392): King Chang of Goryeo is forced from power and replaced by King Gongyang. The ten-year-old Chang and his predecessor, U, are both assassinated later in the year.
- Hadji II is restored as Mamluk Sultan of Egypt, after overthrowing Sultan Barquq.
- With the backing of Antipope John XXIII, supporters of Louis II overthrow the underage King Ladislaus as King of Naples. The new Pope Boniface IX recognises Ladislaus's claim to the throne.
- Wikramawardhana succeeds Hayam Wuruk, as ruler of the Majapahit Empire (now Indonesia).
- The unpopular Sultan Tughluq Khan of Delhi is murdered and succeeded by his brother, Abu Bakr Shah.
- Biri II succeeds Kade Alunu as King of the Kanem-Bornu Empire (now eastern Chad and Nigeria), and the Empire loses its land in present-day Chad to the Bilala.
- Sandaki overthrows Magha II, as Mansa of the Mali Empire.
- Abd ar-Rahmân II succeeds Musa II as ruler of the Ziyanid Dynasty, in present-day western Algeria.
- Abu Tashufin II succeeds his nephew, Abu Hammu II, as ruler of the Abdalwadid Dynasty in present-day eastern Algeria.
- Carmo Convent is built in Lisbon, Portugal.