That's a very good point, I hadn't picked up on that before.
The Hebrew of Genesis 10:11 was probably designed to give a double meaning. We are learning to expect this, along with the author's delight in subtly taking us forward and backward in time as the narrative progresses.
The NIV and RSV translations of Genesis 10:11 read:
"From that land (Babylon) he went to Assyria and built Ninevah"
The Shocken Bible like the KJV reads:
"From this land Ashur went forth and built Ninevah"
I identify Ashur as Shamshi-Adad, the contemporary of Hammurabi.
Yet, Nimrod and Sargon very likely owned the name/title of the god Ashur/Assur before him.
The earliest association of Assur seems to have been with Enlil. Later, "under Sargon II ... Assur tended to be identified with Anshar, the father of Anu. ... (Then) under Sargon's successor Sennacherib, an attempt was made, at an official level, to reattribute to Assur the mythology of the Babylonian national god Marduk". The symbols of Assur were the snake-dragon, the horned cap, and the winged disk. (Ref: God's, Demons and Symbols of Ancient Mesopotamia)
Anshar was a type of Atum/Adam. Marduk on the other hand was a counterpart of Ra/Jacob. However, it looks like Assur was or became a Mesopotamian form of the syncretized Atum-Re. Similarly, Sargon the Great was characterized in the Bible as both an Adam and a Jacob/Israel.
So, the Nimrod passage not only anticipates Sargon (Adam II) but also Shamshi-Adad (Ashur son of Shem II) in whose time Assryia emerged as an imperial nation.
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