Chronological entries assess the careers of each of 50 prime ministers since 1721, and include details on ancestors and progeny, spouses and mistresses, and significant professional and personal events, as well as quotes, elections, appointments, and governments formed. Each entry includes a b&w illustration. A second section offers comparative data on PMs' residences, education, zodiac signs, continuous service in Houses of Parliament, and age at appointment. An introduction discusses the office of the prime minister in the 20th century. Annotation c. by Book News, Inc., Portland, Or.