 It has been a common view among political philosophers that there exists a special relationship between moral goodness and legitimate authority. Many authors (especially those who composed mirror-of-princes books or royal advice books during the Middle Ages and Renaissance) believed that the use of political power was only rightful if it was exercised by a ruler whose personal moral character was strictly virtuous. Thus rulers were counseled that if they wanted to succeed—that is, if they desired a long and peaceful reign and aimed to pass their office down to their offspring—they must be sure to behave in accordance with conventional standards of ethical goodness. In a sense, it was thought that rulers did well when they did good; they earned the right to be obeyed and respected inasmuch as they showed themselves to be virtuous and morally upright (see Briggs and Nederman forthcoming).