What god put a plaque on the Achaeans?

In Greek mythology, it was the god Apollo who put a plague upon the Achaeans during the Trojan War. This occurred as a punishment for Agamemnon's disrespect towards Chryses, a priest of Apollo, after he refused to return Chryses' daughter, leading Apollo to unleash a deadly plague on the Greek forces. The situation is detailed in Homer's "Iliad," where the Achaeans suffer until they appease Apollo by returning Chryseis and offering sacrifices.