Zeno of Citium and the Stoic School

Zeno of Citium who lived in 4-3 centuries B.C. is one of the most important philosophers. He, for the first time, separated philosophy to the three parts including logic, physics and ethics, and put ethics in the centre of philosophy based on the teachings of Socrates and the Cynics. Furthermore, he considered that physics is necessary to substantiate ethics scientifically, and he referred logic to corroborate physics and ethics as well. According to him logic is required for all the types of sciences. Zeno is the founder of the Stoic School. Many philosophers had been studied at the Stoic School that was continued for about 5 centuries. Chrysippus, Cleanthes, Panaetius, Seneca and Cicero is just a few of them.