Question: Who is reported in some ancient sources to have been a philosopher who was the earliest Greek to develop the theory of atomism, who had a daughters were sought by he jealous murderer of Castor? 
Sentence (from "Brychon"): Brychon or Vrychonas (Ancient Greek: Βρύχων, Modern Greek: Βρύχωνας, English translation: "the roaring one") was the name of two different small rivers in Greece.
Relevant evidence: No