The Roman emperor Hadrian, who lived from 76 to 138 AD was a hugely influential figure whose architectural legacy is obvious even today. However, he was also contradictory and mysterious: he was a Spaniard who became emperor at Rome; he was a popular, successful soldier who aimed to be a man of peace. He dabbled in black magic, and he courted scandal: as well as his bitterly unhappy marriage, he had a very public love affair with Greek boy, who...