Manchester City Football Club is an English football club based in Manchester that competes in the Premier League, the top flight of English football. Founded in 1880 as St. Mark's (West Gorton), it became Ardwick Association Football Club in 1887 and Manchester City in 1894. The club's home ground is the City of Manchester Stadium in east Manchester, to which it moved in 2003, having played at Maine Road since 1923. Manchester City entered the Football League in 1899, and won their first major honour with the FA Cup in 1904. It had its first major period of success in the late 1960s, winning the League, FA Cup and League Cup under the management of Joe Mercer and Malcolm Allison. After losing the 1981 FA Cup Final, the club went through a period of decline, which eventually saw them relegated as far down as third tier of English football by the end of the 1997–98 season. They since regained promotion to the top tier in 2001–02 and have remained a fixture in the Premier League since 2002–03. In 2008, Manchester City was purchased by Abu Dhabi United Group for £210 million and received considerable financial investment. The club have won six domestic league titles. Under the management of Pep Guardiola they won the Premier League in 2018 becoming the only Premier League team to attain 100 points in a single season. In 2019, they won four trophies, completing an unprecedented sweep of all domestic trophies in England and becoming the first English men's team to win the domestic treble. Manchester City's revenue was the fifth highest of a football club in the world in the 2018–19 season at €568.4 million. 2019, Forbes estimated the club was the fifth most valuable in the world at $2.69 billion, however the sale of a 10% stake in the club's parent company City Football Group on 27 November 2019 for $500 million values them significantly higher.