Geoffrey Chaucer ( c. 1343 – 25 October 1400) was an English author, poet, philosopher, bureaucrat, courtier and diplomat. Although he wrote many works, he is best remembered for his unfinished frame narrative The Canterbury Tales. Sometimes called the father of English literature, Chaucer is credited by some scholars as the first author to demonstrate the artistic legitimacy of the vernacular Middle English, rather than French or Latin.

http://www.bbc.co.uk/history/historic_figures/chaucer_geoffrey.shtml

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