Leon first joined the Swans on loan from West Ham in December 2002 before making the move permanent the following summer.
Although he missed half of his first season through injury, having suffered a triple cheekbone fracture, he went on to win both the PFA Divisional Player of the Year and the club's Young Player of the Year awards.
The diminutive midfielder was a regular on the right last season and turned in a number of star performances to earn him a clean sweep of awards as Player of the Year, Players' Player and Away Fans Player of the Year.
The former England youth midfielder joined the Hammers from Arsenal for £400,000 in 1998 at the age of 16.
He signed a new three-year contract in August 2007 and played an important role in the League One title winning season.
An even more impressive season was to follow in the Championship as Brits picked up a number of man-of-the-match awards following a string of excellent performances. At the club's end of season Awards the fans favourite walked away with the Players' Player of the Year and Away Player of the Year awards.
He made his 300th appearance for the Swans against Middlesbrough in 2009/10, but found himself in and out of the side under former manager Paulo Sousa as discussions broke down over a new contract.
It prompted Leon to quit the Swans for a free transfer to Sheffield United.
"It was the toughest decision of my career,'' he said at the time. “I wish the club well because the fans deserve all the success in the world.''
But after less than seven months at Bramall Lane, he jumped at the chance to return to the Liberty in January 2011 and he helped the Swans to the Premier League – scoring a stunning strike against Nottingham Forest in the semi-final second leg.
He is one of only three current players - Alan Tate
and Garry Monk the other two - who will have played in all four divisions with the club after playing in the famous victory over Hull City at the Vetch Field that secured the Swans their Football League status at the end of the 2002-03 season.
He enjoyed another fine season at the Liberty as the Swans finished 11th in the top flight.
Brits became the first player to record perfect passing stats when he completed all 67 attempts against Bolton, while he had the best pass completion rate in Europe – beating the likes of Andres Iniesta, Xavi and Cesc Fabregas.
Brits signed a new contract extension with the Swans in February 2013, keeping him at the Liberty Stadium until 2016, having played in excess of 400 games for the club.
After making 34 appearances in all competitions in the 2013-14 campaign, the little midfielder penned another one-year extension that keeps him in SA1 until June 2017.
Britton, however, found his game time limited during the club's record-breaking campaign in 2014-15.
An injury at the start of the campaign meant he missed all games from July until November, and he made his comeback against Arsenal in November.
He made 27 appearances in the 2015-16 season, in which he passed 500 appearances for the club, as the Swans finished 12th in the Premier League.