Felipe Fernandez-Armesto&rsquos Amerigo (Weidenfeld and Nicolson, Rs 1,100, 248pp) is less the story of &ldquothe man who gave his name to America,&rdquo as the subtitle would have it, than that of the times in which Amerigo Vespucci lived. The golden age of nautical exploration yielded not only Vespucci but also Columbus, Cabot, da Gama, Magellan and Cortez, men of varying degrees of perspicacity and a uniform stoutness of heart. Change a few names and dates around, and Amerigo could be the story of any one of them it is a template rather than a portrait of a specific personality.