The Iliad by Homer

Nine years after the start of the Trojan War, the Greek (“Achaean”) army sacks Chryse, a town allied with Troy. During the battle, the Achaeans capture a pair of beautiful maidens, Chryseis and Briseis. Agamemnon, the leader of the Achaean forces, takes Chryseis as his prize, and Achilles, the Achaeans’ greatest warrior, claims Briseis. Chryseis’s father, Chryses, who serves as a priest of the god Apollo, offers an enormous ransom in return for his daughter, but Agamemnon refuses to give Chryseis back. Chryses then prays to Apollo, who sends a plague upon the Achaean camp.