Istustaya (Ištuštaya) is one of the two Hattian goddesses of destiny, always paired with Papaya. In the Old Hittite ritual for the founding of a new palace the Throne sends an eagle to the shore of the sea, where the two primeval goddesses sit crouching with spindles, distaff and mirrors, spinning the years of the king; the passage is the classic Anatolian counterpart to the spinning fate-goddesses of other ancient traditions. In the Hittite state cult the pair belonged to the circle of chthonic deities and was worshipped together with the netherworld goddess Lelwani.
Alfonso Archi, "The Anatolian Fate-Goddesses and their Different Traditions", in E. Cancik-Kirschbaum, J. Klinger & G. G. W. Müller (eds.), Diversity and Standardization: Perspectives on Social and Political Norms in the Ancient Near East, Berlin: Akademie Verlag, 2013
Volkert Haas, Geschichte der hethitischen Religion (Handbuch der Orientalistik I/15), Leiden: Brill, 1994
Old Hittite foundation ritual for a new palace, KUB 29.1 (CTH 414)