Hellenistic or Koine (meaning common) Greek has been proved to be the language of the New Testament period through the discoveries among the Greek papyri.
It is a remarkable reminder of the culture of the Getes, a Thracian people who were in contact with the Hellenistic and Hyperborean worlds, according to ancient geographers.
Its star attraction is an excavated site of ancient Hellenistic and Roman ruins that include the remnants of a colossal amphitheater and various temples.
Clearly, the city's people were assimilating to the Greek culture, and their increasingly Hellenistic tendencies were preserved when the Romans took over.
In the far less urbanized west the Roman culture did not have to compete with Hellenistic ways it therefore established deeper roots and did so more quickly.
But the most remarkable philosophic trend in the late Hellenistic period was first and foremost inspired by Plato's philosophy. We therefore call it Neoplatonism.