Plato's birth name was Aristocles. He was name 'Platon' (meaning
broad or muscular) by his wrestling coach in his childhood.
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Since 'Plato" is a nickname for Aristocles he apparently had
broad shoulders. The busts of him that I have seen indicate that he
was probably just broad in general
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Plato's given name was Aristocles. Plato was his nickname, given
to him as an adult because of his broad head (Plato means
broad).