This image, depicting military men, is from a freize originally located at a royal palace in Susa (one of the Persian Empire's four capital cities). It is now maintained at the Pergamon Museum in Berlin. Scholars believe the freize depicts members of Xerxes' personal bodyguard (called the Immortals).
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Photo by mshamma, online courtesy Flickr.
License: This photo is licensed under the Creative Commons Attribution ShareAlike 2.0 License. In short: You are free to share and make derivative works of it under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one.