Troilus and Criseyde is a Middle English epic poem composed by Geoffrey Chaucer in the late fourteenth century.
It belongs to the medieval literature known as the Matter of Rome, which embroidered on the classical myths. While Troilus, the son of Priam was known to the ancients primarily for his murder by Achilles, medieval traditions of courtly romance endowed him with a lover, who became Criseida in Boccaccio, the most immediate inspiration for Chaucer's own version of the tale.
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Free online texts
Gutenberg: Troilus and Criseyde. EPUB, HTML, MOBI and TXT formats.
Internet Archive: Troilus and Criseyde. 1888 edtion. EPUB, MOBI, PDF and TXT formats.
Online Medieval and Classical Library: Troilus and Criseyde. HTML format
Wikisource: Troilus and Criseyde. HTML and other formats.
BBC Radio 4 In Our Time: Chaucer. Melvyn Bragg with Carolyne Larrington, Helen Cooper, and Ardis Butterfield.
Librivox: Troilus and Criseyde. Public domain audiobook reading of original Middle English.
Wikipedia: Geoffrey Chaucer - Troilus and Criseyde
Further reading at Tom's Learning Notes
Bloom's Westen Canon: Troilus and Cressida is listed.
Cypria: Largely lost tale from the epic cycle which featured an early version of the story of Troilus.
Homer: The Iliad
Boethius: Consolation of Philosophy
Bocaccio: Il Filostrato
Shakespeare: Troilus and Cressida