Yazilikaya (written rock) is the largest known Hittite rock sanctuary. It may have been a place for celebrating the arrival of the New Year each spring. It was established in its present form by Hittite king Tudhaliya IV.
A substantial building blocked outside entrance to Chamber A.
Chamber A was carved in high relief with the Hurrian Pantheon. It depicts two processions, with male deities on the left (two exceptions) and female deities on the right. Luwian hieroglyphs provide each deity's name above its projecting hand. The two processions meet at the back wall at Chamber A's main scene, a meeting of the Storm God Tesup and the Sun Goddess Hepat. Opposite the main scene is the largest relief in the chamber, a portrayal of Hittite king Tudhaliya IV.
Through a narrow passage is Chamber B, a late 13th cent BC memorial dedicated to Tudhaliya IV by his son Supiluliuma II. Chamber B was buried until the late 19th cent, keeping its reliefs well-preserved. The Chamber B reliefs depict: the 12 Gods of the Underworld; Nergal, god of the Underworld; a cartouche with the name of Tudhaliya IV; and the god Sarruma guiding Tudhaliya IV. The limestone block near the entrance was likely a base for a statue of Tudhaliya IV. Niches in the chamber could have held offerings.