Clinomachus ( Greek: Κλεινόμαχος; 4th-century BC), was a Megarian philosopher from Thurii, Magna Graecia. He is said by Diogenes Laërtius to have been the first who composed treatises on the fundamental principles of dialectics, [1] and is described as the founder of the Dialectical school. [2] According to the Suda, he was the disciple of Euclid of Megara, [3] and he taught Bryson, the teacher of Pyrrho. [4] He thus lived towards the earlier half of the 4th century BC.