Year 1175 (MCLXXV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
A Song Dynasty Chinese written record of this year states that a paper-printed-money factory in the city of Hangzhou alone employs a daily work force of more than 1,000.
Ly Cao Ton becomes ruler of Vietnam.
The Kingdom of Namayan reaches its peak on Luzon.
British isles
Henry II of England begins living openly with his friend Rosamund Clifford, raising suspicions about their relationship & alienating Henry's wife, Eleanor of Aquitaine
Treaty of Windsor: Ruaidrí Ua Conchobair (Rory O'Conner), the last High King of Ireland, submits to Henry II as vassal of Ireland.
The Massacre of Abergavenny ends with several Welsh noblemen dead at the orders of William de Braose.
Vordingborg Castle is completed.
Byzantium
Byzantine Emperor Manuel Comnenus restores the trading privileges of Venice.
Iberia
Under the admirals of the clan Banu Mardanish, an Almohad fleet suffers a large defeat at the hand of the Portuguese, as they were trying to reconquer Lisbon.
The high academy of Bosnian religious organization in Moštre, Visoko, is first mentioned in Vatican archives.
William of Tyre becomes archbishop of Tyre.
date unknown
Otto IV, Holy Roman Emperor (d. 1218)
Roger III of Sicily (d. 1194)
Michael Scot, Scottish mathematician and astrologer (d. 1232)
probable
Frederick I of Austria (d. 1198)
Robert Grosseteste, English statesman, theologian and bishop (d. 1253)
May 15 – King Mleh, Prince of Armenia
November 13 – Henry of France, Archbishop of Reims (b. c.1121)
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