Marcus Tullius Cicero, the greatest of Roman orators and the chief master of Latin prose style, was born at Arpinum, Jan. 3, 106 B.C. His father, who was a man of property and belonged to the class of the "Knights," moved to Rome when Cicero was a child; and the future statesman received an elaborate education in rhetoric, law, and philosophy, studying and practising under some of the most noted teachers of the time. He began his career as an advocate at the age of twenty-five, and almost immediately came to be recognized not only as a man of brilliant talents but also as a courageous upholder of justice in the face of grave political danger. After two years of practice he left Rome to travel in Greece and Asia, taking all the opportunities that offered to study his art under distinguished masters. He returned to Rome greatly improved in health and in professional skill. As a philosopher, Cicero's most important function was to make his countrymen familiar with the main schools of Greek thought. Much of this writing is thus of secondary interest to us in comparison with his originals, but in the fields of religious theory and of the application of philosophy to life he made important first-hand contributions. From these works have been selected the two treatises, on Old Age and on Friendship, which have proved of most permanent and widespread interest to posterity, and which give a clear impression of the way in which a high-minded Roman thought about some of the main problems of human life.