How may a 17th century theory about the Fifth Empire and the succession of empires be so similar to the 2nd century BCE theory introduced by the Book of Daniel? How was this possible in the works of Antonio Vieira, S.J., (1608-1697), and particularly in his famous manuscript, the Clavis Prophetarum - De Regno Christi In Terris Consummato? This book analyzes the history of the interpretation of concepts such as Fifth Empire and succession of ages from as early as the 2nd century B.C. until the 17th century. Influenced by the main intellectual and religious tendencies of the 17th century, Vieira's interpretation has revealed itself to be original in the way that it introduces a new reading/interpretation of the succession of historical periods. The Jesuit also identifies the antichrist and the Last Emperor with historical characters of his time.