This system is to control people authority , so that one person or function can't get all the power, it protect so other people or authority will not take advantage
Members of a college of three members. The expression is mostly used to describe the First Triumvirate (60 BCE; Pompey the Great, Crassus, and Julius Caesar) and Second Triumvirate (43 BCE; Marc Antony, Lepidus, and Octavian)
-Gregory
