 Yet, more recent theories and evidence suggest that a Proto-Indo-Hittite language dates back to the fourth millennium BCE, prior to the Bronze Age.According to Mellaart, archaeological evidence shows that the cities of Erzerum, Sivas, Pulur Huyuk near Baiburt, Kultepe near Hafik, and Maltepe near Sivas were destroyed during the Middle Bronze Age.The great trading city of Kanesh (Level II) was also destroyed.