There are sites north of the black sea that were first investigated by eucranian and russian archaeologists back in the 19 seventies. They found settlements as old as the first cities in mesopotamia, which are generally regarded as the earliest cities in the world. There is no obvious evidence for wealth in equalities or rich burials at all. What you have ae these settlements planned on the image of a circle, like some basque and urban traditions in more recent times. And they look a bit like tree rings - vast thousands of people in circular arrangements of houses.