High Quality Content by WIKIPEDIA articles! Mansel Alcantra or Alcantara (fl. 1829) was a Spanish pirate active in the South Atlantic during the early 19th century. As well as committing acts of piracy, he was also responsible for several incidents of mass murder. The most infamous of these acts occurred in 1829 when his brig, the Macrinarian, captured the Liverpool packet ship Topaz near St. Helena while en route from Calcutta to Boston. After he and his men had finished looting the ship, Alcantara had the entire crew murdered.