Manchester United won 6-0 at Watford and the FA Cup final at Wembley Stadium in London, England.
It's the sixth time at Manchester United and FA's first win after director Pep Guardiola.
Having already won the Premier League EPL and the League Cup, Manchester City added the FA Cup Trophy to complete Treble & # 39;
The trophy came in four, including Community Shield (last season's EPL champion and FA Cup winners) over Chelsea in August.
That made Manchester City the first male football team to win every tournament in England in one season.
It was only ten years since Chelsea's 2009-2010 season that the team that won the championship dominated the FA Cup.
The victory of the FA Cup final with six goals was also 116 years since Rydd Derby's defeat in 1903 6-0.
Manchester City has been firm in Watford from the start.
David Silva's opening goal in the 26th minute and Gabriel Uejjaz's 38th-minute goal led to a 2-0 lead.
In the second half, Jeju, Kevin The Brainer and Rahim Sterling added a goal to Man City, who won six of the last six at Watford.
Watford defeated Everton in the FA Cup final after 35 years since 1984 when he was 2-0.
Manchester City's regional rival Manchester United were awarded a ticket to the UEFA Europa League group stage when they beat Manchester City.
The FA Cup winners go straight into the UEFA Champions League group stage as Manchester City win the Premier League title to qualify for the UEFA Champions League.
UEFA Europa League tickets were awarded to UEFA, sixth in the EPL.