Geoffrey Chaucer (1340-1400) is considered to be the greatest English poet of the Middle Ages. He maintained a career in civil service for most of his life, working as a courtier, diplomat, and was even a member of Parliament, however, he is famed for his literary work. Best known for his book The Canterbury Tales, Chaucer normalized the use of Middle English in a time when the respected literary languages were French and Latin, causing a revolutionary impact on literature. Chaucer is regarded as the father of English Literature for his invaluable contributions and innovations to the art.