1386 (MCCCLXXXVI)was acommon year starting on Monday of theJulian calendar, the 1386th year of theCommon Era (CE) andAnno Domini (AD) designations, the 386th year of the2nd millennium, the 86th year of the14th century, and the 7th year of the1380s decade. As of the start of 1386, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.
- Elizabeta Kotromanic, the mother of the overthrown QueenMary of Hungary andCroatia, arranges the assassination ofCharles of Durazzo, the ruler ofHungary,Naples,Achaea andCroatia.
- Mary is reinstated as Queen of Hungary and Croatia.
- Charles' son,Ladislas, becomes King of Naples.
- A period ofinterregnum begins in Achaea, lasting until1396. Rule of Achaea is sought by numerous pretenders, none of whom can be considered to have reigned.
- July 9 –Battle of Sempach: TheSwiss safeguard independence fromHabsburg rule.
- QueenJadwiga of Poland marries Grand DukeJagiello of Lithuania, unifying their two countries.
- Abu al-Abbas is reinstated as ruler of theMarinid dynasty in present-dayMorocco.
- John of Gaunt leavesEngland to make good his claim to the throne ofCastile by right of his second marriage to Constanza of Castile in1371.
- TheTimurid Empire raidsGeorgia and takes KingBagrat V prisoner. Bagrat is subsequently freed by an army led by his son,George.
- Hundred Years' War – Battle ofMargate: TheEnglish defeat an invadingFrench andCastilian naval force.
- Dan I ofWallachia (now southernRomania) is killed in battle against theBulgarians and is succeeded byMircea the Old.
- May 9 – KingJohn I of Portugal and KingRichard II of England ratified theTreaty of Windsor.
- May 20 – First mention of the city ofPiteşti, now in Romania.
- Founding ofRuprecht Karl University of Heidelberg, the oldest university inGermany.
- TheVenetians take control of the island ofCorfu.
- TheBrancacci Chapel begins to be built inFlorence.
- Rozhdestvensky monastery is built inMuscovy.
