Birtha (Mesopotamia) bastions are quite traceable. There are the ruins of a vaulted secret staircase, leading down from the heart of the citadel to the water's edge. Birtha (Mesopotamia) Birtha () was an ancient fortress on the river Tigris, which was said to have been built by Alexander the Great. It would seem, from the description of Ammianus, to have resembled a modern fortification, flanked by bastions, and with its approaches defended by out-works. Shapur II here closed his campaign in 360, and was compelled to retire with considerable loss. D'Anville and Edward Gibbon both identify Birtha as modern-day Tikrit, Iraq. The
Art of Mesopotamia that of Babylonian art, which was the dominant contemporary art in Mesopotamia, began to emerge c. 1500 BC, well before their empire included Sumer, and lasted until the fall of Nineveh in 612 BC. The conquest of the whole of Mesopotamia and much surrounding territory by the Neo-Assyrian Empire created a larger and wealthier state than the region had known before, and very grandiose art in palaces and public places, no doubt partly intended to match the splendour of the art of the neighbouring Egyptian empire. From around 879 BC the Assyrians developed a style of extremely large schemes of