The fact that the philosopher in his maturity called himself "Platon" is indisputable, but the origin of this name remains mysterious. "Platon" is a nickname from the adjective "platýs" () 'broad'. Although "Platon" was a fairly common name (31 instances are known from Athens alone), the name does not occur in Plato's known family line. The sources of Diogenes Laërtius account for this by claiming that his wrestling coach, Ariston of Argos, dubbed him "broad" on account of his chest and shoulders, or that Plato derived his name from the breadth of his eloquence, or his wide forehead. While recalling a moral lesson about frugal living Seneca mentions the meaning of Plato's name: "His very name was given him because of his broad chest."