Events Henry II of England wishes aloud that Thomas Becket be destroyed. December 29 – Thomas Becket, Archbishop of Canterbury,'s assassinated in Canterbury Cathedral. The city of Dublin's captured by the Normans. According to folklore, the Welsh prince Madoc sailes to North America 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.(External Link) The Danes attack Est… (More on 1170)