Sethianism was one of the main currents of Gnosticism during the 2nd to 3rd centuries, and the prototype of Gnosticism as condemned by Irenaeus. Sethianism attributed its "gnosis" to Seth, third son of Adam and Eve and "Norea", wife of Noah, who also plays a role in Mandeanism and Manicheanism. Their main text is the "Apocryphon of John", which does not contain Christian elements, and is an amalgam of two earlier myths. Earlier texts such as Apocalypse of Adam show signs of being pre-Christian and focus on the Seth, third son of Adam and Eve. Later Sethian texts continue to interact with Platonism. Sethian texts such as Zostrianos and Allogenes draw on the imagery of older Sethian texts, but utilize "a large fund of philosophical conceptuality derived from contemporary Platonism, (that is, late middle Platonism) with no traces of Christian content."