Roman Navigation
Topsails (Greek: sipharos; Latin: siparum) in the form of an isosceles triangle set above the square mainsail were used in Roman navigation.
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“We do not preach great things but we live them.”
—Marcus Minucius Felix (late 2nd or early 3rd ce, Roman Christian apologist. Octavius, 38. 6, trans. by G.H. Rendell.