According to Neville Judd's authorized biography Al Stewart: The True Life Adventures of a Folk Rock Troubadour
, this is based rather loosely on Dr. Josef Mengele, the so-called Angel of Death from the Auschwitz concentration camp. He was probably the most notorious Nazi to avoid capture after the Second World War. After fleeing to South America he became a citizen of Paraguay but eventually moved to Brazil where he drowned in an accident in 1979.
Alexander Baron - London, England