Deaths on January 20

Frederick VI, Duke of Swabia (b. 1167)

Frederick VI of Hohenstaufen (February 1167 – 20 January 1191) was duke of Swabia from 1170 until his death at the siege of Acre.

12 May

Berengaria of Navarre
Richard I of England marries Berengaria of Navarre who is crowned Queen consort of England the same day.
12 Jul

Siege of Acre (1189-91)
Third Crusade: Saladin's garrison surrenders to Philip Augustus, ending the two-year siege of Acre.
20 Aug

Massacre at Ayyadieh
Richard I of England initiates the Massacre at Ayyadieh, leaving 2,600-3,000 Muslim hostages dead.
7 Sep

Battle of Arsuf
Third Crusade: Battle of Arsuf: Richard I of England defeats Saladin at Arsuf.