Jo Evelein
In that era women's water polo was not an Olympic discipline, and wouldn't be until 2000. Evelein had taken the initiative that a water polo match was played at the 1920 Summer Olympics as an exhibition match and managed to raise the necessary money for it. In this Olympic demonstration event two Dutch teams played against each other in the same venue as the men's competition. Evelein was also one of the players herself.