 Based on plentiful cultural evidence, Petrie determined that the invader race had come from Mesopotamia, and imposed themselves on the native Badarian culture to become their rulers.Petrie adduced new architectural styles—the distinctly Mesopotamian "niched-facade" architecture—pottery styles, cylinder seals and a few artworks, as well as numerous Predynastic rock and tomb paintings depicting Mesopotamian style boats, symbols, and figures.This came to be called the "dynastic race theory" The theory further argued that the Mesopotamians then conquered both Upper and Lower Egypt and founded the First Dynasty.