Short answers, pulled from the story.
A modern scholar coined the label Neoplotnicism to describe a series of Platonic thinkers from the third century AD onward. Before that label emerged, these philosophers simply called themselves Platonists.
Plotinus lived until 270 AD and serves as the father of Neoplotnicism. He studied under Ammonius Saccas who taught that Plato and Aristotle were in harmony.
Hypatia served as head of the Platonist school in Alexandria until her murder in 415 AD by Coptic Parabalani monks. She taught philosophy, mathematics, and astronomy while advising prefect Orestes during his feud with Cyril.
Augustine of Hippo used Neoplotnicism as a bridge on his journey from Manichaeism to Christianity. His conversion changed his views entirely so he came to believe evil was merely a privation of good rather than a substance.
Turkish, Persian, and Arabic thinkers such as Avicenna and al-Farabi adapted concepts to fit monotheistic constraints. They attributed the First Principle directly to God who remains transcendent and omnipresent.