Not quite d20, but possibly useful for OGL Ancients...

trancejeremy

Mongoose
Cthulhu Invictus - Call of Cthulhu in the Roman empire.

While OGL Ancients doesn't cover Rome, if you read the description of Cthulhu Invictus, apparently it also covers Egypt and Persia.

http://www.yog-sothoth.com/modules.php?name=News&file=article&sid=139&mode=&order=0&thold=0
 
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