Pyrrho
c. 360–270 BC. Sailed with Alexander to India and came home the first Skeptic. Calm in a storm, like the pig on deck.
Every line we've sourced
Storm at sea, crew in a panic, and the pig keeps eating. Be that calm.
"τῶν γὰρ συμπλεόντων αὐτῷ ἐσκυθρωπακότων ὑπὸ χειμῶνος, αὐτὸς γαληνὸς ὢν ἀνέρρωσε τὴν ψυχήν, δείξας ἐν τῷ πλοίῳ χοιρίδιον ἐσθίον"
Diogenes Laertius 9.68, our translation from the Greek