Before William Shakespeare, Geoffrey Chaucer was the preeminent English poet, and he remains in the top tier of the English canon. He also was the most significant poet to write in Middle English. Chaucer was born in the early 1340s to a fairly rich though not aristocratic family. His father, John Chaucer, was a vintner and deputy to the king's butler. His family's financial success came from work in the wine and leather businesses, and they had considerable inherited property in London. Little information exists about Chaucer's education, but his writings demonstrate a close familiarity with a number of important books of his contemporaries and of earlier times (such as Boethius's The Consolation of Philosophy). Chaucer likely was fluent in several languages, including French, Italian, and Latin. Sons of wealthy London merchants could receive good educations at this time, and there is reason to believe that, if Chaucer did not attend one of the schools on Thames Street near his boyhood home, then he was at least well-educated at home. Certainly his work showcases a passion for reading a huge range of literature, classical and modern.
Chaucer first appears in public records in 1357 as a member of the house of Elizabeth, Countess of Ulster. This was a conventional arrangement in which sons of middle-class households were placed in royal service so that they could obtain a courtly education. Two years later, Chaucer served in the army under Edward III and was captured during an unsuccessful offensive at Reims, although he was later ransomed. Chaucer served in a number of diplomatic missions.
By 1366, Chaucer had married Philippa Pan, who had been in service with the Countess of Ulster. Chaucer married well for his position, for Philippa Chaucer received an annuity from the queen consort of Edward III. Philippa's sister Katherine de Roet (later Lady Swynford, later Duchess of Lancaster) was John of Gaunt's mistress for twenty years before becoming the Duke's wife. Through this connection, John of Gaunt was Chaucer's "kinsman." Chaucer himself secured an annuity as yeoman of the king and was listed as one of the king's esquires.
Chaucer's first published work was The Book of the Duchess, a poem of over 1,300 lines, supposed to be an elegy for Blanche, Duchess of Lancaster, addressed to her widower, the Duke. For this first of his important poems, which was published in 1370, Chaucer used the dream-vision form, a genre made popular by the highly influential 13th-century French poem of courtly love, the Roman de la Rose, which Chaucer translated into English. Throughout the following decade, Chaucer continued his diplomatic career. During his missions to Italy, Chaucer encountered the work of Dante, Petrarch, and Boccaccio, which were later to have a profound influence on his own writing. In 1374, Chaucer was appointed comptroller of the customs and subsidy of wool, skins, and tanned hides for the Port of London, his first position away from the British court. Chaucer's only major work during this period was House of Fame, a poem of around 2,000 lines in dream-vision form, which ends so abruptly that some scholars consider it unfinished.
In October 1385, Chaucer was appointed a justice of the peace for Kent, and in August 1386 he became knight of the shire for Kent. Around the time of his wife's death in 1387, Chaucer moved to Greenwich and later to Kent. Changing political circumstances eventually led to Chaucer falling out of favor with the royal court and leaving Parliament, but when Richard II became King of England, Chaucer regained royal favor.
During this period, Chaucer used writing primarily as an escape from public life. His works included Parlement of Foules, a poem of 699 lines. This work is a dream-vision for St. Valentine's Day that makes use of the myth that each year on that day the birds gather before the goddess Nature to choose their mates. This work was heavily influenced by Boccaccio and Dante.
Chaucer's next work was Troilus and Criseyde, which was influenced by The Consolation of Philosophy, which Chaucer himself translated into English. Chaucer took some the plot of Troilus from Boccaccio's Filostrato. The Canterbury Tales secured Chaucer's literary reputation and was his great literary accomplishment; it consists of a compendium of stories by pilgrims traveling to the shrine of Thomas Becket in Canterbury.
Geoffrey Chaucer is said to have died around the year 1400, although the exact date is not known. He was buried in Westminster Abbey.