1175

Events 
 Ruaidri Ua Conchobair, last High King of Ireland, submits to Henry II as vassal of Ireland with the Treaty of Windsor
 Ly Cao Ton becomes ruler of Vietnam
 William of Tyre becomes archbishop of Tyre
 Massacre of Abergavenny ends with several noblemen dead under William de Braose
 Vordingborg Castle is finished.

 Births 
 Andrew II of Hungary, King of Hungary (died 1235)
 Frederick I of Austria (died 1198)
 Robert Grosseteste, English statesman, theologian and bishop (approximate date; died 1253)
 Fibonacci, Italian mathematician (approximate date; died 1250)
 Otto IV, Holy Roman Emperor (died 1218)
 Roger III of Sicily (died 1194)
 Michael Scot, Scottish mathematician and astrologer (died 1232)

 Deaths 
 Mleh of Armenia, ruler of the Armenian Kingdom of Cilicia
 Judyta, wife of Ladislaus II of Hungary and Otto I von Brandenburg (born 1132)

*