Civilizations of the Fertile Crescent: The Assyrians
The Assyrians were rivals of the Babylonians and the Egyptians, and produced strong kings with names like Shamshi-Adad and Tiglath Pileser I. Like the Babylonians, the Assyrians were powerful for a time, then declined, then returned as the "New" Assyrian Empire later. The modern country of Syria traces its name back to the ancient Assyrians.
Here are a few sources on the Assyrians:
New York Metropolitan Museum of Art
History for Kids: Assyrians
All Empires: Assyrians