One example of a Hellenistic philosophy that nearly became a religion and let to Plato's ideas dominating the middle ages was:

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Neoplatonism was a philosophical system that emerged in the Hellenistic period and was heavily influenced by the ideas of Plato. It sought to merge the ideas of Plato with those of other Hellenistic schools of philosophy, as well as with eastern religions such as Hinduism and Buddhism. Neoplatonism was seen as a spiritual path by many of its adherents, and some even considered it to be a religion. The ideas of Neoplatonism were influential in the Middle Ages, particularly in Christian theology, and helped to shape the dominant intellectual paradigm of the period.

One Example of a Hellenistic Philosophy That Nearly Became a Religion