In the middle of the third millennium BCE, about 4,500 years ago.
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The Ziggurat of Ur was built in, 2100 b.c.
Ur-Nammu was the king that ordered the ziggurat at Ur to be built.
The ancient city of Ur was Sumer's capital. I thought the city of Agade was the capital of the Sumerian empire. See link
Nahor was an ancestor of Abraham, so he would have been Sumerian, and followed Sumerian deities. Since they were from Ur, the patron deity of that city was Sin (also called Nanna), Sumerian goddess of the Moon.
2100b.C.