Triathlon had its Summer Olympics debut at the 2000 Games, in Sydney, when men's and women's individual events were first held, and has been contested since then. In 2021, at the delayed 2020 Summer Olympics a mixed team relay event was held for the first time. The sport, and its Olympic events, are governed by the International Triathlon Union, known since 2019 as World Triathlon. Summary History The 2000 Summer Olympics saw the first appearance of the triathlon. 48 women and 52 men competed in separate triathlons. The distances used were the "international" or "standard" ones, with a swim, cycle, and a run. The 2004 triathlon was identical to the first in distance, but the 100-athlete quota was evened between 50 women and 50 men. The quota was further increased to 55 women and 55 men for the 2008 Beijing Olympics and remained the same for London 2012 and Rio 2016. Results summary Only one athlete, Great Britain's Alistair Brownlee, has ever won the Olympic triathlon twice (in 2012 and 2016), making him the most successful Olympic triathlete. Brother Jonathan Brownlee uniquely has won three medals in three consecutive Games, bronze in 2012, silver in 2016 and finally a gold in the inaugural team relay in 2020, thus making him the most decorated Olympic triathlete, and the only three time medalist. Several other athletes have also won two medals, including a silver and bronze for New Zealander Bevan Docherty, and two Olympic champions, Canada's Simon Whitfield and Switzerland's Nicola Spirig, who both won a gold, followed by a silver medal. Katie Zaferes, Alex Yee and Georgia Taylor-Brown became the first triathletes to win two medals in the same Games in 2021 with the introduction of the mixed relay, the latter two athletes becoming the most successful triathlete in a single Games with a gold (relay) and a silver (individual) medal. Great Britain is the most successful nation as of 2021, with three gold, three silver and two bronze medals. New Zealand (2004) and Great Britain (2016) are the only nations to have completed a one-two finish in an individual event. No nation has yet won both women's and men's individual events at the same Games, or indeed in any Games - in fact, only two nations, Switzerland and Great Britain, have won medals in both men's and women's individual events as of 2021, and only Great Britain have won medals