Question: Christian O'Brien was involved in the discovery of Chogha Zanbil; which is one of the few ziggurats outside of where?
Sentence (from "Igi-Halki"): He is also mentioned as the father of king Attar-kittah on two mace heads found in Chogha Zanbil, and in the inscription of king Shilhak-Inshushinak as the father of kings Pahir-ishan and Attar-Kittah.
Relevant evidence: No