Final answer:
Amenophis IV, also known as Akhenaten, was a monotheist who introduced the worship of Aten as the supreme deity in ancient Egypt.
Step-by-step explanation:
Amenophis IV, also known as Akhenaten, was indeed a monotheist. He is famously known for introducing the worship of a single god, Aten, and initiating a religious revolution during the 18th Dynasty of ancient Egypt. Prior to his reign, Egypt practiced polytheism, worshiping multiple gods and goddesses. Akhenaten sought to establish Aten as the supreme deity, and he even changed his own name from Amenophis IV to Akhenaten, which means 'Effective for Aten.' This radical religious shift influenced various aspects of Egyptian art, culture, and society during his reign.
Learn more about Ancient Egypt Monotheism