These slaves, of whom there were at least one hundred thousand adult males, relieved the twenty-five thousand freemen of nearly all the severe drudgery of life; and the result was an amount of leisure perhaps never since known on an equal scale in history. See Herod. V. 97; Aristoph. Ekkl. 432; Thukyd. II. 13; Plutarch, Perikl. 37.