Troilus and Cressida is a play by William Shakespeare, probably written around 1602. This tragedy recounts events from the Trojan War and follows the storyline of Homer's Iliad.
The young Troilus woos Cressida, another young Trojan woman, who gives in to his court and swears loyalty to him. But Cressida has to be exchanged for a prisoner and finds herself on the Greek side, where Troilus surprises her being seduced by Diomedes, which leads him to fight to get revenge. In addition, Achilles cowardly kills Troilus' brother, the Trojan hero Hector, while he is unarmed.