Samuel Noah Kramer, writing in 1963, stated that the three most important deities in the Mesopotamian pantheon during all periods were the deities
An,
Enlil, and
Enki. However, newer research shows that the arrangement of the top of the pantheon could vary depending on time period and location. The Fara god list indicates that sometimes Enlil,
Inanna and Enki were regarded as the three most significant deities. Inanna was also the most important deity in Uruk and a number of other political centers in the Uruk period.
Gudea regarded
Ninhursag, rather than Enki, as the third most prominent deity. An Old Babylonian source preserves a tradition in which
Nanna was the king of the gods, and Anu, Enlil and Enki merely his advisers, likely a view espoused by Nanna's priests in
Ur, and later on in
Harran. An Old Babylonian personal name refers to
Shamash as "Enlil of the gods," possibly reflecting the existence of a similar belief connected to him among his clergy too, though unlike the doctrine of supremacy of the moon god, accepted by
Nabonidus, it found no royal support at any point in time. In Zabban, a city in the northeast of Babylonia,
Hadad was the head of the pantheon. In the first millennium BCE
Marduk became the supreme god in Babylonia, and some late sources omit Anu and Enlil altogether and state that Ea received his position from Marduk. In some neo-Babylonian inscriptions
Nabu's status was equal to that of Marduk. In Assyria,
Assur was regarded as the supreme god. The number seven was extremely important in ancient Mesopotamian cosmology. In
Sumerian religion, the most powerful and important deities in the pantheon were sometimes called the "seven gods who decree":
An,
Enlil,
Enki,
Ninhursag,
Nanna,
Utu, and
Inanna. Many major deities in Sumerian mythology were associated with specific celestial bodies: Inanna was believed to be the planet
Venus, Utu was believed to be the Sun, and Nanna was the Moon. However, minor deities could be associated with planets too, for example Mars was sometimes called
Simut, and
Ninsianna was a Venus deity distinct from Inanna in at least some contexts. ==Primordial beings==