Zenon, also known as Zeno of Citium, was a Greek philosopher who founded the school of Stoicism around the early 3rd century BCE. He taught that virtue, wisdom, and self-control are essential for a good life, emphasizing the importance of living in harmony with nature and accepting the things we cannot change. Stoicism, the philosophy Zenon established, encourages individuals to focus on their own actions and responses rather than external circumstances. It promotes resilience and emotional strength, teaching that true happiness comes from within and is achieved through rational thought and ethical behavior.