Barbēlō (Greek: Βαρβηλώ) refers to the first emanation of God in several forms of Gnostic cosmogony. Barbēlō is often depicted as a supreme female principle, the single passive antecedent of creation in its manifoldness. This figure is also variously referred to as 'Mother-Father' (hinting at her apparent androgyny), 'First Human Being', 'The Triple Androgynous Name', or 'Eternal Aeon'. So prominent was her place amongst some Gnostics that some schools were designated as Barbeliotae, Barbēlō worshippers or Barbēlō gnostics. The nature of Barbēlō Nag Hammadi Library In the Apocryphon of John, a tractate in the Nag Hammadi Library containing the most extensive recounting of the Sethian creation myth, the Barbēlō is described as "the first power, the glory, Barbēlō, the perfect glory in the aeons, the glory of the revelation". All subsequent acts of creation within the divine sphere (save, crucially, that of the lowest aeon Sophia) occurs through her coaction with God. The text describes her thus: Barbēlō is found in other Nag Hammadi writings: Allogenes makes reference to a Double Powerful Invisible Spirit, a masculine female virgin, who is the Barbēlō. The Holy Book of the Great Invisible Spirit refers to a divine emanation called 'Mother', who is also identified as the Barbēlō. Marsanes—several places. Melchizedek—twice, the second time in a prayer of Melchizedek: "Holy are you, Holy are you, Holy are you, Mother of the aeons, Barbelo, for ever and ever, Amen." The Three Steles of Seth offers a description of "the first aeon, male virginal Barbelo, the first glory of the invisible Father, she who is called 'perfect'." Trimorphic Protennoia ('First Thought in Three Forms'), even in the first person: "He perpetuated the Father of all Aeons, who am I, the Thought of the Father, Protennoia, that is, Barbelo, the perfect Glory, and the immeasurable Invisible One who is hidden. I am the Image of the Invisible Spirit, and it is through me that the All took shape, and (I am) the Mother (as well as) the Light which she appointed as Virgin, she who is called 'Meirothea', the incomprehensible Womb, the unrestrainable and immeasurable Voice." Zostrianos—the aeon Barbēlō is referred to in many places. In Zostrianos, Barbelo has three sublevels or subaeons that represent three distinct phases: Kalyptos ("Hidden One"), the first and highest subaeon within the Aeon of Barbelo, representing the initial latency or potential existence of the Aeon of Barbelo. Protophanes ("First Appearing One"),