Perhaps the greatest medieval romance is the fourteenth century English poem, Troilus and Criseyde, by Geoffrey Chaucer. While Homer focused on the impact of passion (both love/lust and rage) on war, Chaucer puts love and loss in the foreground, with a background of war and the unavoidable destruction of Troy.
Chaucer also sets the story of Troy into a Christian perspective, by having a Christian narrator relate the poignant, yet pagan, story. The narrator initially is in love with love, but learns through Troilus' tragedy to focus instead on the enduring love of the Christian God.
Troilus is a noble Trojan knight who scorns love until he is shot by the God of Love and forced to love a beautiful young widow, Criseyde. She is loveable, but not steadfast, and after she is sent to the Greek camp to reunite with her father, she quickly falls out of love with Troilus and in love with a Greek, Diomede. Broken hearted, Troilus battles furiously against the Greeks until he is killed. After death, Troilus goes to the eighth sphere, not exactly heaven, because he is not a Christian, but far enough away from earth to gain some perspective on the foolishness of human concerns, whether love or war.
Chaucer was gentle with Criseyde; later authors were not; Henryson's Testament of Cresseid treats her as a worthless woman who comes to a bad end. Shakespeare's also trashes the lady in his bitter play, Troilus and Cressida.