Aristotle, Plato's most famous student, broke from his teacher and founded the Lyceum in Athens around 335 BCE; his followers were called Peripatetics, supposedly for his habit of teaching while walking. Where Plato looked to ideal Forms, Aristotle looked at the world itself — pioneering logic, biology, and an ethics built on virtue as a “golden mean” between extremes, aimed at eudaimonia, or human flourishing. His work was rediscovered in medieval Europe and fused with Christian thought by Thomas Aquinas.