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 "Lynceus (Argonaut)"): In Greek mythology, Lynceus or (Ancient Greek: Λυγκεύς ) was the jealous murderer of Castor, along with his brother, Idas.
Relevant evidence: Yes