[Unam Sanctam]

Hmmm. I wonder if they spoke an Indo-European language and were part of the spread of agriculture, which the article places at around 6,500 BC in Europe.

[Cronos]

I kind of doubt that -- Indo-Europeans seem to have originated in the Kuban and only really civilized around the 2nd millenium when they domesticated horses.

It's interesting, but at the time of Sumeria's greatness (3000 BC), all Indo-Europeans (whether ancestors of Indians, Persians, Germans, Italians, Greeks) may have been a group of people living between the black and caspian seas.