The Persian Empire and the Greek Empire are always intertwined. Persia would influence Greece with their invasions, as well as their treatment of peoples they conquered. was a mark of the Persian Empire and later Alexander the Great as well. As Greek society developed, Athens focus was on and while Sparta focused on and . All city states had an at the center of the Polis and an for all the people to trade goods at. Greek culture centered around its geography and climate, with people always outdoors and interacting. Later Socrates would hold his seminars in the agora in front of all the public, discussing , , and .