Geoffrey Chaucer (/ˈtʃɔːsər/; c. 1343 - 25 October 1400), known as the Father of English literature, is widely considered the greatest English poet of the Middle Ages and was the first poet to be buried in Poets' Corner of Westminster Abbey.While he achieved fame during his lifetime as an author, philosopher, and astronomer, composing a scientific treatise on the astrolabe for his ten-year-old son Lewis, Chaucer also maintained an active career in the civil service as a bureaucrat, courtier and diplomat. Among his many works, which include The Book of the Duchess, the House of Fame, the Legend of Good Women and Troilus and Criseyde. He is best known today for The Canterbury Tales.Chaucer was a crucial figure in developing the legitimacy of the vernacular, Middle English, at a time when the dominant literary languages in England were French and Latin. Bio from Wikipedia, the free encyclopedia. Photo by Unknown British 17th century (object page; previous upload was here) [Public domain], via Wikimedia Commons.