The Indo-Europeans whom we find in Mesopotamia (the Kassites and Mitannians) * and in Palestine about 1400 B.C. can hardly have entered western Asia before 2000 B.C. or thereabouts, and it is probable that the Hittites belonged to the same wandering.
On entering *The fact that the Mitannians venerated Varuna, Indra, and the Asvins is important as showing that Iranian and Indian Aryans had not yet separated as late as 1400 B.C.
Their subjects, on the contrary, speak absolutely different tongues: for the attempts to explain the languages of the Cossaeans, Mitannians, and Arzapians as Indo-European (Iranian) have ended in failure (cf.