Collectors are often praised for their taste in art or contributions to science, but there can be a darker side: their passion is sometimes driven by dangerous obsession. Roman emperors who lusted after statues; Chinese scholars obsessed with rocks and flowers; fin de siècle dandies surrounded by bibelots. History is full of stories about those who love things more than people, presenting a danger either to themselves or others. In this sweeping history from antiquity to today, James Delbourgo tells the extraordinary story of the mad collector as a cultural figure from the tyrant and idolater to the sexually repressed "psycho" of the Freudian imagination and the modern-day hoarder. His conclusion is surprising: Because they are driven by passion rather than profit, obsessive collectors also have been cultural heroes, seen as authentic and true to themselves. Some may be mad, but theirs is a noble madness.