Yilbegän ([jilbe`gæn]; Йилбегән; Yelbegän, Kazan Tatar language: Cilbegän/Җилбегән) is a multi-headed man-eating monster in the mythology of Turkic peoples of Siberia, as well as Siberian Tatars. In some myths Yilbegän is a winged dragon or serpent-like creature, while in others he is an ogre-like behemoth who rides a 99-horned ox. Some epics feature multiple Yilbegän with different numbers of heads who are the offspring of Altan Sibaldai, "the golden witch", a cohort of the lord of the underworld. Some epics also mention a Yilbegän king named Yelmogus.