London 1883: Prelude to the First World Championship Match (April 26, 1883 - June 23, 1883)
London, with its rich chess tradition, has been the scene of many great tournaments. One of these, the London International Tournament of 1883, happened at an important point in history. It is remembered mainly as the event that led to the first World Chess Championship, which, in turn, formalized the title of World Champion. Johannes Zukertort (pictured) won the tournament ahead of Wilhelm Steinitz, and in 1886, three years after London, they played the first official World Championship match against each other.
Source: chessbase.com