1170s

• September 21 – Following a siege, combined Anglo-Norman and Irish forces seize the city of Dublin, forcing Ascall mac Ragnaill, King of Dublin, into exile.[1]
• November (or December) – Henry II of England, when word reaches him in France of Thomas Becket's latest actions, utters words that are interpreted by his followers as a wish for the archbishop's death.
• December 29 – Thomas Becket, Archbishop of Canterbury, is assassinated in Canterbury Cathedral.

• The Danes attack Estonia.
• The East Frisian island of Bant is broken up in a North Sea flood.
• Palace guards massacre the civil officials at the Korean court, and place a new king on the throne. The coup leaders abolish the privileges that have kept the aristocrats in power, and appoint themselves to senior posts.
• Earliest date for the making of Cheddar cheese.
• According to folklore, the Welsh prince Madoc sails to North America, in his ship the Gwennan Gorn, and founds a colony.
• Estimation: Fes in the Almohad Empire becomes the largest city of the world, taking the lead from Constantinople, capital of the Byzantine Empire.[2]

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