As Henry VIII's court painter, Hans Holbein witnessed and recorded the most notorious era in English history. He painted most of the major characters of the age and created the famous image of the king himself that everyone today still recognises. But who really was Holbein? Where did he come from? And what were the dark and unsettling secrets hidden in his art? Waldemar Januszczak looks at the life and work of an artist who became famous for bringing the Tudor age to life, but who could have been so many other things.