The Rugby World Cup is a men's rugby union tournament contested every four years between the top international teams. The tournament is administered by World Rugby, the sport's international governing body. The winners are awarded the Webb Ellis Cup, named after William Webb Ellis, who according to a popular legend, invented rugby by picking up the ball during a football game. The tournament was first held in 1987 and was co-hosted by New Zealand and Australia. Four countries have won the trophy; New Zealand and South Africa three times, Australia twice, and England once. South Africa is the current champion, having defeated England in the 2019 tournament final. Sixteen teams participated in the tournament from 1987 until 1995; since 1999, twenty teams have participated in each tournament. Japan hosted the 2019 Rugby World Cup and France will host the next in 2023. Beginning 2021, the women's equivalent tournament was officially renamed Rugby World Cup to promote equality with the men's game. Format Qualification Under the current format, 20 teams qualify for each Rugby World Cup. Twelve teams qualify automatically based on their performance in the previous World Cup — the top three teams in each of the four group (pool) stages of the previous tournament qualify for the next tournament as seeded teams. The qualification system for the remaining eight places is region-based, with a total eight teams allocated for Europe, five for Oceania, three for the Americas, two for Africa, and one for Asia. The last place is determined by an intercontinental play-off. Tournament The tournament involves twenty nations competing over six weeks. There are two stages — a pool, followed by a knockout round. Nations are divided into four pools, A through to D, of five nations each. The teams are seeded based on the World Rankings. The four highest-ranked teams are drawn into pools A to D. The next four highest-ranked teams are then drawn into pools A to D, followed by the next four. The remaining positions in each pool are filled by the qualifiers. Nations play four pool games, playing their respective pool members once each. A bonus points system is used during pool play. If two or more teams are level on points, a system of criteria determines the higher ranked. Eight teams — the winner and runner-up from each of the four pools — enter the knockout stage. The knockout stage consists of