This chapter poses the central question: If the Roman princeps was first among equals, what position and visibility did an imperial woman have? The chapter provides some fundamental definitions, including of “imperial woman,” Augusta, and principate, and points to the laws and customs inhibiting Roman women’s activities and choices. It substantiates the importance of women for the imperial image, for legitimacy in the principate, and for the imperial court. After laying out the general plan of the book, the chapter points out deficiencies and biases of the evidence, especially of Tacitus and other literary sources, and clarifies how the book references inscriptions, coins, and other ancient material. Guidance is given for names, locations, and the like.