The founder of the system was ZENO, from Citium in Cyprus (he lived from 340--260 B.C.), who derived his first impulse from Krates the Cynic. He opened his school in a building or porch, called the _Stoa Poecile_ ('Painted Portico') at Athens, whence the origin of the name of the sect. Zeno had for his disciple CLEANTHES, from Assos in the Troad (300--220 B.C.), whose _Hymn to Jupiter_ is the only fragment of any length that has come down to us from the early Stoics, and is a remarkable production, setting forth the unity of God, his omnipotence, and his moral government. CHRYSIPPUS, from Soli in Cilicia (290--207 B.C.), followed Cleanthes, and, in his voluminous writings, both defended and modified the Stoical creed. These three represent the _first_ period of the system. The _second_ period (200--50 B.C.) embraces its general promulgation, and its introduction to the Romans. Chrysippus was succeeded by ZENO of Sidon, and DIOGENES of Babylon; then followed ANTIPATER, of Tarsus, who taught PANAETIUS of Rhodes (d. 112 B.C.), who, again, taught POSIDONIUS of Apamea, in Syria. (Two philosophers are mentioned from the native province of St. Paul, besides Chrysippus--ATHEKODOEUS, from Cana in Cilicia; and ARCHEDEMUS, from Tarsus, the apostle's birthplace. It is remarked by Sir A. Grant, that almost all the first Stoics were of Asiatic birth; and the system itself is undeniably more akin to the oriental mind than to the Greek.) Posidonius was acquainted with Marius and Pompey, and gave lessons to Cicero, but the moral treatise of Cicero, _De Officiis_, is derived from a work of Panaetius. The _third_ period of Stoicism is Roman. In this period, we have Cato the Younger, who invited to his house the philosopher Athenodorus; and, under the Empire, the three Stoic philosophers, whose writings have come down to us--SENECA (6 B.C.-65 A.D.), EPICTETUS (60-140 A.D.), who began life as a slave, and the Emperor MARCUS AURELIUS ANTONINUS (121-180 A.D.). Stoicism prevailed widely in the Roman world, although not to the exclusion of Epicurean views. The leading Stoical doctrines are given in certain phrases or expressions, as 'Life according to Nature' (although this phrase belongs also to the Epicureans), the ideal 'Wise Man,' 'Apathy,' or equanimity of mind (also an Epicurean ideal), the power of the 'Will,' the worship of 'Duty,' the constant 'Advance' in virtue, &c. But perspicuity will be best gained by considering the _Moral_ system under four heads--the Theology; the Psychology or theory of mind; the theory of the Good or human happiness; and the scheme of Virtue or Duty.