He was born in Collytus, just outside Athens, most likely before 445 BC (as he was old enough to serve in the Athenian army during the Battle of Megara, in 424 BC).
La lahir di Collytus, di luar Athena, kemungkinan besar sebelum tahun 445 SM (karenanya ia cukup tua untuk ebrtugas di tentara Athena selama Pertempuran Megara, pada tahun 424 SM).