Upton Park FC, founded in 1866, were an amateur football club from Upton Park, London in the late 19th and early 20th century. As well as being one of the fifteen teams that played in the inaugural FA Cup, they also represented Great Britain at the 1900 Summer Olympics football tournament, which they won. Though resolutely an amateur club, they inadvertently sparked the legalisation of professionalism in the game after complaining about Preston North End's payments to players when the two met in the FA Cup in 1884; Preston were disqualified, but the incident made the FA confront the issue and, under threat of a breakaway, they allowed payments to players the following year. The club were wound up in 1887 but were resurrected four years later in 1891. In 1892 they were founder members of the Southern Alliance, an early league competition amongst teams from southern England, but were bottom of the league with only one win to their name when the competition folded before the 1892-93 season ended. Upton Park continued to play until at least 1911, according to modern-day records.  The Upton Park Trophy, the annual playoff between the league champions of Guernsey and Jersey, is named for the Upton Park side, to commemorate their tenth annual tour of the islands, which they made in 1906. Upton Park were reformed in 2016 and played against the Royal Engineers in the final game at West Ham's Boleyn Ground.