- 1265 20 Jan The first English parliament is held by Simon de Montfort and attended by elected burgesses and knights.
- 1841 20 Jan China cedes Hong Kong to Britain following the island's capture and occupation in the First Opium War.
- 1942 20 Jan Reinhard Heydrich outlines extermination of Europe's Jewish population at the Wansee Conference, Berlin.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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