ελληνική μυθολογία Mystery Cache

I was digging through my stuff the other day, deciding to clean out, tonnes of old paper which is useless to me. But then I happened to find this (in photo below). Some odd sort of language and weird numbers. It supposedly leads to a treasure. I am desperate to find the treasure and have not managed to decipher it. I was told to find out what 8 digit number fills in all those x's and stick it into certitude

You can validate your puzzle solution with certitude.