Philalethians
The group of mystics and philosophers founded by Ammonius Saccas in 193 CE. The term means “lovers of truth,” and the school became known as the Neo-Platonic school. The group included Plotinus, its most famous exponent. It was also called the Eclectic Theosophical School, which Helena P. Blavatsky considered to be the precursor of the modern Theosophical Society (TS).
Ammonius Saccas
The Philalethians had their division into neophytes (chelas) and Initiates or Masters; and the eclectic system was characterised by three distinct features, which are purely Vedantic; a Supreme Essence, One and Universal; the eternity and indivisibility of the human spirit; and Theurgy, which is Mantricism. So also, as we have seen, they had their secret or Esoteric teachings like any other mystic school. Nor were they allowed to reveal anything of their secret tenents, any more than were the Initiates of the Mysteries (CW 14:309).