Third Dynasty of Ur
The majority of Sumerian deities belonged to a classification called the "Anunna" (“[offspring] of An”), whereas seven deities, including Enlil and Inanna, belonged to a group of “underworld judges" known as the "Anunnaki" (“[offspring] of An” + Ki). During the Third Dynasty of Ur, the Sumerian pantheon was said to include sixty times sixty (3600) deities.