Now much of that archaeological wealth is under the control of extremists from the Islamic State group. The militants have demolished some artifacts in their zealotry to uproot what they see as heresy, but they are also profiting from it, hacking relics off palace walls or digging them out to sell on the international black market.
When the militants overran the northern city of Mosul and surrounding Ninevah province in June, they captured a region were nearly 1,800 of Iraq's 12,000 registered archaeological sites are located. They snapped up even more as they pushed south toward Baghdad.
The Assyrians first arose around 2500 BC and at one point ruled over a realm stretching from the Mediterranean coast to Iran.
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The heaviest damage confirmed so far has taken place in the grand palace at Kalhu, from which Assyrian King Ashurnasirpal II reigned in the 9th century B C, Rasheed said.
The palace walls are lined with reliefs describing the king's military campaigns and conquests or depicting him hunting lions or making sacrifices to the gods.
Recently they carved off a relief depicting a winged demon holding a sacred plant and sold it abroad, he said. "It is now beyond borders."
Authorities fear other sites will soon face destruction, including Mosul's city museum, which has rare collections of Assyrian artifacts, and the 2,300-year-old city of Hatra, a well preserved complex of temples further south. From both locations, militants ordered out antiquities officials, chastising them for protecting "idols," Rasheed said.