In January 1913, a man whose passport bore the name Stavros Papadopoulos disembarked from the Krakow train at Vienna's North Terminal station. Of dark complexion, he sported a large peasant's moustache and carried a very basic wooden suitcase.
"I was sitting at the table," wrote the man he had come to meet, years later, "when the door opened with a knock and an unknown man entered. "He was short... thin... his greyish-brown skin covered in pockmarks... I saw nothing in his eyes that resembled friendliness."
The man he described was not, in fact, Papadopoulos. He was known to his friends as Koba and is now remembered as someone else.
They were just two of a number of men who lived in central Vienna in 1913 and whose lives were destined to mould, indeed to shatter, much of the 20th century.
Who are these two men??