Valentinus

Valentinus (Greek: Οὐαλεντῖνος; c. 100 – c. 165 CE) was the best known and, for a time, most successful early Christian Gnostic theologian. He founded his school in Rome.

Valentinus produced a variety of writings, but only fragments survive, largely those quoted in rebuttal arguments in the works of his opponents, not enough to reconstruct his system except in broad outline. His doctrine is known only in the developed and modified form given to it by his disciples, the Valentinians. He taught that there were three kinds of people, the spiritual (pneumatics), psychical (psychics), and material (hylics); and that only those of a spiritual nature received the gnosis (knowledge) that allowed them to return to the divine Pleroma, while those of a psychic nature (ordinary Christians) would attain a lesser or uncertain form of salvation, and that those of a material nature were doomed to perish.

Valentinus had a large following, the Valentinians. It later divided into an Eastern and a Western, or Italian, branch. The Marcosians belonged to the Western branch.

Source: Wikipedia — https://en.wikipedia.org/wiki/Valentinus_(Gnostic)