African mantis

And found in Greece, too. http://www.projectnoah.org/spottings/36543003

Ooh, it looks like a Sphodromantis viridis. Certainly not Mantis religiosa. The Sphodromantis viridis I think is introduced to Italy and Spain and Portugal: http://www.entomologiitaliani.net/public/forum/phpBB3/viewtopic.php?f=11&t=39875 http://www.projectnoah.org/spottings/5963395 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3964699/

This would be a nice addition to the global Mantis mission: http://www.projectnoah.org/missions/15738247

This is a beautiful mantis! However, I do believe this is not a European Mantis. The body shape and patterning on the wings are not consistent. More likely this is either a Sphodromantis or Hierodula species. Unfortunately, I am not familiar with the species found in your area. Perhaps you can find some local resources that have more information.