
Opis (Akkadian Upî or Upija; Ὦπις) was an ancient Babylonian city near the Tigris, not far from modern Baghdad. Akkadian and Greek texts indicate that it was located on the east side of the Tigris, near the Diyala River. While the precise site of the city has been considered uncertain for a long time, recent geographical surveys of ancient M...
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http://en.wikipedia.org/wiki/Opis

(from the article `Alexander the Great`) The issue came to a head at Opis (324), when Alexander`s decision to send home Macedonian veterans under Craterus was interpreted as a move toward ...
Found on
http://www.britannica.com/eb/a-z/o/23
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