The Canterbury Tales is a/an -

Geoffrey Chaucer (1340-1400):
The outstanding English poet before Shakespeare.

His 'The Canterbury Tales' ranks as one of the greatest Poetic works in English.
The Canterbury Tales is a collection of 24 stories that runs to over 17,000 lines written in Middle English by Geoffrey Chaucer between 1387 and 1400.
The tales (mostly written in verse, although some are in prose) are presented as part of a story-telling contest by a group of pilgrims as they travel together on a journey from London to Canterbury to visit the shrine of Saint Thomas Becket at Canterbury Cathedral.

His other notable works-
- 'Troilus and Criseyde',
- 'The Parliament of Foules',
- 'The Pardoner’s Tale',
- 'The Miller’s Tale',
- 'The Friar’s Tale',
- 'The Nun’s Priest’s Tale',
- 'The Clerk’s Tale',
- 'The Man of Law’s Tale',
- 'The Franklin’s Tale'.

Source: Britannica.com