The 2016 Summer Olympics, hosted in Rio de Janeiro, Brazil, were officially designated as the Games of the XXXI Olympiad. The numbering system for the modern Olympic Games tracks each celebration of the Games since their revival in 1896. The XXXI Games took place from August 5 to August 21, 2016, marking the first time the event was held in South America.

Women's athletic events were first introduced to the Olympic program at the 1912 Stockholm Games. While the inclusion of women in the Olympics was a gradual process, 1912 marked the initial appearance of specific track and field events for women. This was a significant step toward gender equality in international sports, paving the way for the expanded participation seen in subsequent decades.

Michael Phelps, an American swimmer, set the record for the most gold medals in a single Olympiad at the 2008 Beijing Games. He secured 8 gold medals, surpassing Mark Spitz's previous record of 7, cementing his status as one of the most decorated Olympians in history.

The ancient Olympic Games were officially abolished by Emperor Theodosius I in 393 CE. They remained dormant until the modern Olympic Games were revived by Pierre de Coubertin in 1896 CE, creating a historical gap of approximately 1,503 years, commonly rounded to 14 centuries.

Women's participation in the modern Olympic Games began at the 1900 Paris Games. Although women were excluded from the inaugural 1896 Games, the International Olympic Committee allowed female athletes to compete in a limited number of sports, such as tennis and golf, in 1900. This event marked a crucial turning point for gender equality in international sports, eventually leading to the full inclusion of women in all Olympic sports.

Polo was first included as an official medal sport in the Olympic program during the 1900 Paris Games. It appeared in several subsequent Olympic Games before being removed from the program after the 1936 Berlin Olympics. Its inclusion in 1900 marked a significant moment in the international recognition of the sport.

The 2004 Summer Olympics, officially known as the Games of the XXVIII Olympiad, were held in Athens, Greece. This was a symbolic return of the Games to their birthplace, as Athens had also hosted the inaugural modern Olympic Games in 1896. The 2004 event was widely celebrated for its cultural significance and the successful integration of historic venues into modern sports competition.

The International Association of Athletics Federations (now known as World Athletics) was founded on July 17, 1912, in Stockholm, Sweden, following the conclusion of the 1912 Olympic Games. It was established to provide a unified set of rules and regulations for international track and field competitions.

Polo was last contested as an official medal sport at the 1936 Summer Olympics held in Berlin. Although there were discussions about its return in later years, it has not been part of the official Olympic program since that time. This historical context is important for understanding the evolution of Olympic sports and the changing priorities of the International Olympic Committee.

The 2004 Summer Olympics, officially known as the Games of the XXVIII Olympiad, were held in Athens, Greece. This was a historic occasion as the Games returned to their birthplace. Athens hosted the inaugural modern Olympics in 1896, and the 2004 event celebrated this legacy by bringing the world's athletes back to the city where the modern Olympic movement was revived.