thumb|Chaucer reciting Troylus and Criseyde: early 15th-century manuscript of the work at Corpus Christi College, Cambridge Troilus and Criseyde () is an epic poem by Geoffrey Chaucer which re-tells in Middle English the tragic story of the lovers Troilus and Criseyde set against a backdrop of war during the Siege of Troy. It was composed using rime royale and probably completed during the mid-1380s. Many Chaucer scholars regard it as the poet's finest work. As a finished long poem it is more self-contained than the better known but ultimately unfinished The Canterbury Tales. This poem is often considered the source of the phrase: "all good things must come to an end" (3.615).