The Babylonian Chaldeans and Pergamos

The Chaldean Magi enjoyed a long period of prosperity at Babylon. A pontiff appointed by the sovereign ruled over a college of seventy-two hierophants. ... [After the Medo-Persian occupation], the defeated Chaldeans fled to Asia Minor, and fixed their central college at Pergamos, and took the Palladium of Babylon, the cubic stone, with them. Here, independent of state control, they carried on the rites of their religion, and plotted against the peace of the Persian Empire, caballing with the Greeks for that purpose.

Barker, William B., Lares and Penates, London: Ingram, Cooke, and Co., 1853, pp. 232, 233.