The Eleatics were a group of pre-Socratic philosophers and school of thought in the 5th century BC centered around the ancient Greek colony of Velia (), located around 80 miles south-east of Naples in southern Italy, then known as Magna Graecia.
The primary philosophers who are associated with the Eleatic doctrines are Parmenides, Zeno of Elea, and Melissus of Samos, although other Italian philosophers such as Xenophanes of Colophon and Empedocles have also sometimes been classified as members of this movement. The Eleatics have traditionally been seen as advocating a strict metaphysical view of monism in response to the materialist monism advocated by their predecessors, the Ionian school.
There is generally a consensus that Parmenides lived in the early 5th century BC, based on the date and setting of the fictionalized events in Plato's Parmenides where Parmenides and Zeno travel to Athens and have a debate with a young Socrates. This would place Parmenides well after other philosophers such as Xenophanes, Heraclitus, and Pythagoras. Although many philosophers throughout history have interpreted the doctrines of the Eleatics as responses to Xenophanes, Heraclitus, or Pythagoras, there is no broad agreement or direct evidence of any influence or direct response, although many theories have been put forth interpreting the Eleatics in terms of these philosophers. For philosophers after Parmenides, however, the relative chronology and potential directions of influence become even more difficult to determine.
For Zeno, it is not clear whether or not Anaxagoras or Empedocles influenced or were influenced by any of his ideas, although they appear to have lived at approximately the same time. For Melissus, who lived one generation later, the problem of influence is further complicated by additional potential influences of Leucippus, Democritus, and Diogenes of Apollonia. For example, some interpreters see Melissus as responding to Leucippus' atomism, which is then responded to by Democritus - but others see Melissus responding to Democritus.
This concept was further expanded upon by Melissus of Samos, who was one of the first philosophers to champion the principle that nothing can come from nothing,"οὐδαμὰ ἂν γένοιτο οὐδὲν ἐκ μηδενός (... in no wise could anything have arisen out of nothing)". and that a Unmoved mover was necessary for the universe to exist. He believed that this first cause (called "The One") had to be both Eternity and Infinity, and that because it is infinite it also cannot be divided into parts, as that would require those parts having to establish finite boundaries in relation to each other. Since The One is already whole it can't change in any way, shape or form.
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