A portrait of Capt. William Kidd at the Museum of London Docklands, in east London, shown in 2011. Lefteris Pitarakis/AP hide caption toggle caption Lefteris Pitarakis/AP The Two-Way Silver Found Off Madagascar Thought To Be From Capt. Kidd's Treasure May 7, 2015 The Scottish sea captain was hanged as a pirate in 1701. He is known to have sailed to the small island of Sainte Maire off Madagascar in 1698.