Double Sorrow. Troilus and Criseyde, Paperback/Lavinia Greenlaw

Trojan hero Troilus and his beloved Criseyde, whose traitorous father has defected to the Greeks and has persuaded them to ask for his daughter in an exchange of prisoners. In an attempt to save her, Troilus suggests that Criseyde flees the besieged city with him, but she knows that she will be universally condemned.