Gnosticism and Neoplatonism

While Gnosticism was influenced by Middle Platonism, neoplatonists from the third century onward rejected Gnosticism. Nevertheless, Alexander J. Mazur argues that many neoplatonic concepts and ideas are ultimately derived from Sethian Gnosticism during the third century in Lower Egypt, and that Plotinus, the founder of neoplatonism, himself may have been a Gnostic before nominally distancing himself from the movement.

Source: Wikipedia — Gnosticism and Neoplatonism (CC BY-SA 4.0)