 These reveal a rivalry within two branches of the royal family up to the Middle Kingdom; a northern branch first based in Zalpuwa and secondarily Hattusa, and a southern branch based in Kussara (still not found) and the former Assyrian colony of Kanesh.These are distinguishable by their names; the northerners retained language isolate Hattian names, and the southerners adopted Indo-European Hittite and Luwian names.Zalpuwa first attacked Kanesh under Uhna in 1833 BC.