In which Olympics was the first Olympic Oath taken?

The Olympic Oath (distinct from the Olympic creed) is a solemn promise made by one athlete, judge or official, and one coach at the Opening Ceremony of each Olympic Games. Each oath taker is from the host nation and takes the oath on behalf of all athletes, officials, or coaches at the currently celebrated games. While reciting the oath, the oath taker holds a corner of the Olympic Flag.

A call for an oath was announced as early as 1906 by International Olympic Committee (IOC) president and founder Pierre de Coubertin in the Revue Olympique (Olympic Review in French). This was done in an effort to ensure fairness impartiality.

The Olympic Oath was first taken at the 1920 Summer Olympics in Antwerp by the fencer/water polo player Victor Boin. The first judge's oath was taken at the 1972 Winter Olympics in Sapporo by Fumio Asaki.