Full context:   It is also known that the Valentinian Gnostics had established a procession of Eons (immortal essences or energies), that numbered 30; this is the theory of the Plerome, the paradigm of Totality. The 30 eons are divided into three groups: the Ogdoad, the Decad and the Duodecad. Markos of Haeresiarcha (end of the 2nd century A.D.) developed a model that assimilates the Valentinian eons into the operators of astrology: the Ogdoad is formed from the four emanations or primordial eons (the Elements) and the four agents (the elemental values); the Decad is constituted of the seven planets, the "eighth sphere," the Sun and the Moon; and the Duodecad is formed from the twelve Zodiacal signs.   What is remarkable in the author's brief report on his contemporary Irene is not only that the Ogdoad seems to relate to the octotopos, but also that the Gnostics had a kind of foreknowledge about the existence of Uranus and Neptune.