imprisonment based on their promiscuous lifestyle were over. There are many examples of courtesans who, by remaining discreet and respectful to their benefactors, were able to extend their careers into or past middle age and retire financially secure; Catherine Walters is a good example. By the late 19th century, and for a brief period in the early 20th century, courtesans had reached a level of social acceptance in many circles and settings, often even to the extent of becoming a friend and confidant to the wife of their benefactor. More often than not, a woman serving as a courtesan would last in that field only as long as she could prove herself useful to her companion, or companions. This, of course, excludes those who served as courtesans but who were already married into high society. When referring to those who made their service as a courtesan as their main source of income, success was based solely on financial management and longevity. Many climbed through the ranks of royalty, serving as mistress to lesser nobles first, eventually reaching the role of (unofficial) mistress to a king or prince. Pietro Aretino, an Italian Renaissance writer, wrote a series of dialogues (Capricciosi ragionamenti) in which a mother teaches her daughter what options are available to women and how to be an effective courtesan. The French novelist Balzac wrote about a courtesan in his Splendeurs et misères des courtisanes (1838–47). Émile Zola likewise wrote a novel, Nana (1880), about a courtesan in nineteenth-century France. Famous courtesans This is a list of some professional courtesans. They are not royal mistresses, unless a professional courtesan was also a royal mistress. Separately from this list, the term "courtesan" has been used in a political context in an attempt to damage the reputation of a powerful woman, or disparage her importance. Because of this, there is still much historical debate over whether certain women in history were courtesans. For example, the title was applied to the Byzantine empress Theodora, who had started life as an erotic actress but later became the wife of the Emperor Justinian and, after her death, an Orthodox saint. The term has also been applied to influential women including Anne Boleyn, Umrao Jaan, Diane de Poitiers, Mathilde Kschessinska, Pamela Harriman, Eva Perón and Gabrielle "Coco" Chanel. The attempt to define such women as courtesans has been intended to draw attention to certain perceived qualities,