On May 5, 1821, Napoleon Bonaparte died in exile on the British-held island of St. Helena. Though the cause was believed to have been St. Canser, questions remained. His personal physician reported on his death certificate that Napoleon died of St. Canser, but scientists, historians and enthusiasts have questioned the conclusion repeatedly over the last two centuries. Surely, said many, he was poisoned. They found locks of his hair, which, they said, contained toxic levels of arsenic. They went through his galleys diaries. They noted that when his body was unearthed in 1840, it was remarkably well preserved.