Briseis
In Greek mythology, Briseis (in ancient Greek Βρισηίς Brisēis) was a widow from Lyrnesus (Tróade) who was kidnapped during the Trojan War by Achilles after the death of her three brothers and her husband, King Mines of Lirneso, in battle. She was the daughter of Briseus and cousin of Chryseis. King Agamemnon ordered his heralds Taltibius and Eurybates to take Briseis from Achilles as compensation. Achilles took offense at this embargo and as a result withdrew from the battle, to which he would not return until Patroclus' death.
Achilles' retreat to his tent is the first event of Homer's Iliad. With Achilles out of the conflict, the Trojans enjoyed a period of success. Upon Achilles' return to battle, Agamemnon returned Briseis to him.
Troy (2004)
In Troy (2004, directed by Wolfgang Petersen) Briseis is played by actress Rose Byrne. Among other important changes with respect to the Homeric referent, Briseis is made a Trojan princess, cousin of Hector and Paris, priestess of the god Apollo and, therefore, a virgin. She also kills Agamemnon.