Monolatry (Greek: μόνος (monos) = single, and λατρεία (latreia) = worship) is belief in the existence of many gods but with the consistent worship of only one deity. The term "monolatry" was perhaps first used by Julius Wellhausen.
Monolatry is distinguished from monotheism, which asserts the existence of only one god, and henotheism, a religious system in which the believer worships one god without denying that others may worship different gods with equal validity.
The ancient Egyptian Pharaoh Akhenaten initially introduced Atenism in Year 5 of his reign (1348/1346 BCE), during the 18th dynasty. He raised Aten, once a relatively obscure Egyptian Solar deity representing the disk of the Sun, to the status of Supreme God in the Egyptian pantheon.
The fifth year of Amenhotep IV's reign is believed to mark the beginning of his construction of a new capital, Akhetaten (Horizon of the Aten), at the site known today as Amarna. Amenhotep IV officially changed his name to Akhenaten (Agreeable to Aten) as evidence of his new worship. In addition to constructing a new capital in honor of Aten, Akhenaten also oversaw the construction of some of the most massive temple complexes in ancient Egypt, including one at Karnak and one at Thebes, close to the old temple of Amun.
In his ninth year of rule (1344/1342 BCE), Akhenaten declared a more radical version of his new religion, declaring Aten not merely the supreme god of the Egyptian pantheon but the only God of Egypt, with himself as the sole intermediary between the Aten and the Egyptian people. Key features of Atenism included a ban on idols and other images of the Aten, with the exception of a rayed solar disc in which the rays (commonly depicted ending in hands) appear to represent the unseen spirit of Aten. Aten was addressed by Akhenaten in prayers, such as the Great Hymn to the Aten.