Best-known for his sweeping narrative Histories of His Own Times and for his portrait museum on Lake Como, the Italian bishop and historian Paolo Giovio (1486-1552) had contact with many of the protagonists of the great events he so vividly described--the wars of France, Germany, and Spain, and the sack of Rome. He used the information he gleaned from his contacts to carry on an extensive correspondence that became a kind of proto-journalism. With...