Founder of Stoicism (~334-262 BCE), taught at the Stoa Poikile in Athens. Established the school’s logic, physics, and ethics framework after a shipwreck redirected him to philosophy.
Key tenets
Virtue is sufficient for happiness; externals (wealth, health) are indifferent.
Logic, physics, ethics form a single integrated system.
Live according to nature (i.e., according to reason).