Captain George Costentenus arrived in Vienna covered in Burmese tattoos, then became one of P. T. Barnum’s most famous attractions while telling wildly conflicting stories about his past. Historian and librarian Amelia Klem Osterud, a specialist in tattooed performers, investigates the man behind the mythology with Fritz Grobe, a world-record juggler, circus director and award-winning viral-video creator.