Chaucer's first major work was The Book of the Duchess, an elegy for Blanche of Lancaster who died in 1368. Two other early works were Anelida and Arcite and The House of Fame. He wrote many of his major works in a prolific period when he held the job of customs comptroller for London (1374 to 1386). His Parlement of Foules, The Legend of Good Women, and Troilus and Criseyde all date from this time. It is believed that he started The Canterbury Tales in the 1380s.[50]
Chaucer also translated Boethius' Consolation of Philosophy and The Romance of the Rose by Guillaume de Lorris (extended by Jean de Meun). Eustache Deschamps called himself a "nettle in Chaucer's garden of poetry". In 1385, Thomas Usk made glowing mention of Chaucer, and John Gower also lauded him.[51]
Chaucer's Treatise on the Astrolabe describes the form and use of the astrolabe in detail and is sometimes cited as the first example of technical writing in the English language, and it indicates that Chaucer was versed in science in addition to his literary talents.[52] The equatorie of the planetis is a scientific work similar to the Treatise and sometimes ascribed to Chaucer because of its language and handwriting, an identification which scholars no longer deem tenable.[53][54][55]
