Inscriptions in Luvian hieroglyphs at Nişantaş, dates to Şuppiluliuma II (ruling c. 1207–1178 BC) at the base of Nisantepe in the Upper City of Hattusa.
See:
- James G. Macqueen, The Hittites: And Their Contemporaries in Asia Minor, rev. eds., London, Thames and Hudson 1986, pp.23-24
- Gary Beckman, Constructing Sacred Space in Hittite Anatolia, in: Heaven on Earth: Temples, Ritual, and Cosmic Symbolism in the Ancient World eds.Deena Ragavan, OIS 9, Chicago: The Oriental Institute, 2013, pp. 153-173