What Happened in 1366
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- Oct 12 King Frederick III of Siciliy forbids decorations on synagogues
- Oct 26 Comet 55P/1366 U1 (Tempel-Tuttle) approaches 0.0229 AUs of Earth
- Mar 22 Thomas de Mowbray, 1st Duke of Norfolk, English politician (d. 1399)
- Jul 11 Anne of Bohemia, Queen of England and wife of Richard II, born in Prague, Kingdom of Bohemia (d. 1394)
- Jan 25 Henry Suso, German Dominican friar, mystic and popular spiritual writer (Clock of Wisdom), dies at 70