He was tall in stature, his face modest, and very ruddy; he had large eyes, but was dim-sighted; naturally graceful in his person, particularly in his youth, excepting only that his toes were bent somewhat inward, he was at last disfigured by baldness, corpulence, and the slenderness of his legs, which were reduced by a long illness. He was so sensible how much the modesty of his countenance recommended him, that he once made this boast to the senate, "Thus far you have approved both of my disposition and my countenance." His baldness so much annoyed him, that he considered it an affront to himself, if any other person was reproached with it, either in jest or in earnest; though in a small tract he published, addressed to a friend, "concerning the preservation -of the hair," he uses for their mutual consolation the words following: οὐκ ὡράασ οἷοσ κἀγὼ κάλοσ τε μέγας Seest thou my graceful mien, my stately form? "and yet the fate of my hair awaits me; however. I bear with fortitude this loss of my hair while I am still young. Remember that nothing is more fascinating than beauty, but nothing of shorter duration."

He so shrunk from undergoing fatigue, that he scarcely ever walked through the city on foot. In his expeditions and on a march, he seldom rode on horseback, but was generally carried in a litter. He had no inclination for the exercise of arms, but was very expert in the use of the bow. Many persons have seen him often kill a hundred wild animals, of various kinds, at his Alban retreat, and fix his arrows in their heads with such dexterity, that he could, in two shots, plant them, like a pair of horns, in each. He would sometimes direct his arrows against the hand of a boy standing at a distance, and expanded as a mark, with such precision, that they all passed between the boy's fingers, without hurting him.

In the beginning of his reign, he gave up the study of the liberal sciences, though he took care to restore, at a vast expense, the libraries which had been burnt down; collecting manuscripts from all parts, and sending scribes to Alexandria,The famous library of Alexandria collected by Ptolemy Philadelphus had been burnt by accident in the wars. But we find from this passage in Suetonius that part of it was saved, or fresh collections had been made. Seneca (de Tranquill. c. ix 7) informs us that forty thousand volumes were burnt; and Gellius states that in his time the number of volumes amounted to nearly seventy thousand. either to copy or correct them. Yet he never gave himself the trouble of reading history or poetry, or of employing his pen even for his private purposes. He perused nothing but the Commentaries and Acts of Tiberius Caesar. His letters, speeches, and edicts, were all drawn up for him by others; though he could converse with elegance, and sometimes expressed himself in memorable sentiments. "I could wish," said he once, "that I was but as handsome as Metius fancies himself to be." And of the head of some one whose hair was partly reddish, and partly grey, he said "that it was snow sprinkled with mead."