Wikipedia
Eurytus , Erytus , or Eurytos (Εὔρυτος) is the name of several characters in Greek mythology, and of at least one historical figure.
Eurytus (; ; fl. 400 BC), was an eminent Pythagorean philosopher who Iamblichus in one passage describes as a native of Croton, while in another, he enumerates him among the Tarentine Pythagoreans. He was a disciple of Philolaus, and Diogenes Laërtius mentions him among the teachers of Plato, though this statement is very doubtful. It is uncertain whether Eurytus was the author of any work, unless we suppose that the fragment in Stobaeus, which is there ascribed to one Eurytus, belongs to this Eurytus.
Aristotle, ( Metaphysics 1092b) mentions Eurytus, speaking about points as limits of spatial magnitude: Alexander of Aphrodisias elaborates further:
According to the historian's from the Stanford Encyclopedia of Philosophy, Philolaus and Eurytus are identified by Aristoxenus as teachers of the last generation of Pythagoreans (D. L. VIII 46).'' A Echecrates is mentioned by Aristoxenus as a student of Philolaus and Eurytus. (p. 166)