After the death of Patroclus; Agamemnon gives Achilles back Briseis.
Briseis
Achilles loved the Trojan woman Briseis.
Briseis drives the plot of the Illiad; his telling of his weakness to Polyxena is how he dies.
Prior to being a captive of Achilles, Briseis was wife of Mynes and daughter of Briseus.
Briseis was among those to lament and mourn over the death of Patroclus. She remained with Achilles until his death, which plunged her into great grief. She soon took it upon herself to prepare Achilles for the afterlife.According to some, following his death, Briseis: "... was given to one of Achilles' comrades-at-arms just as his armor had been", after the fall of Troy.
Briseis
Agamemnon
Briseis was a princess and queen captured as a war prize of Achilles, she was mortal and had no powers.
Achilles did not fight in the Trojan war until the death of Patroclus.
In the context of the Iliad, Achilles' relationship with Briseis is more about possession and honor rather than love. Achilles values Briseis as a symbolic representation of his status and authority, which is why he reacts so strongly when she is taken from him by Agamemnon. Their relationship is complex and reflects the power dynamics of that society.
Agamemnon and Achilles argued over Briseis, who was Achilles's prize. Agamemnon had to give back his prize, Chryseis, because the Chryseis's father was a priest of Apollo and keeping her is making Apollo mad. In return, Agamemnon decided to take Briseis from Achilles. This caused Achilles to stop fighting in the Trojan War and eventually the death of Patrokolos.
Achilles withdraws from battle because Agamemnon offends him by taking his concubine. Achilles states that if Briseis is not returned to him he will not fight.