The black, green and gold beat Saracens 24-20 in dramatic fashion at Twickenham thanks to Alex Waller's extra-time try. But where are the men who made it happen on that magical day now residing? We answer that question here...
The prop didn't get to play as much as he'd have liked but he still earned a big role in the Premiership final. After leaving Saints, he opted to head to America, where he works as a rugby analyst for NBC Sports.
Played a key role in both finals in 2014 and remains a vital part of the Saints squad, though he missed most of last season due to an ACL injury that is likely to rule him out until around November.
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The man who was sent off for punching Tom Youngs in the semi-final against Leicester, Ma'afu retired after a 16-year career and now works for Lawrence Dallaglio's RugbyWorks, which is 'a development programme based on the values of rugby'.
The Californian crusher was one of the most important players during the double-winning season and he eventually earned a big-money move to Toulon, but he is now back home, playing for 2018 Major League Rugby champions Seattle Seawolves.
The lofty England and Lions lock remains a towering figure at Franklin's Gardens, helping Saints to secure a top-four finish this season and a Premiership Rugby Cup crown, their first trophy since 2014.
Squared up to Saracens in the 2014 final and now plays for them, having decided to make the move to Allianz Park in 2017.
Was the captain on the day at Twickenham, having scored the vital try in the semi-final success against Leicester and he still remains a Saint to this day, having signed a new contract last season.
The No.8 was a big hit during the double-winning year, emerging after joining Saints from Rotherham Titans in 2012. He is now captain of Championship club Ealing Trailfinders.
The Samoan scrum-half was a vital cog in the Saints wheel, helping to take the club to the next level after so much disappointment. He has recently been playing for Bath but left the west country club this summer.
Man of the match in both 2014 finals, the fly-half finally left Saints last summer and has just helped London Irish to return to the Premiership at the first time of asking.
The powerhouse Lions wing decided to head back to Wales last summer as he joined Ospreys after a successful stay with the Saints.
Joined Saints from Sale Sharks in 2012 and went on to become a legendary figure, but his time is now up and he is heading back to rugby league with Warrington Wolves.
A hugely popular figure at Franklin's Gardens, Pisi looked like he would join Stade Franais after leaving Saints but that fell through and he has recently been with Australian outfit Western Force.
Like Luther Burrell, the Samoan wing will be exiting Saints this summer after so many successful years in the black, green and gold. His next destination appears to be Japan or a return to New Zealand.
Called time on his Saints career last summer and is now living the American dream with Major League Rugby outfit Rugby United New York.
Has been co-captain at Saints during the past campaign but has not played since December 21 due to a troublesome knee injury.
The man who scored the dramatic extra-time try that won the final against Saracens has been co-captain alongside Dylan Hartley at Saints this season.
Seemed to go missing after playing rugby as no one heard much about him but we're happy to report that he's living a successful life as director and co-founder at Esports Awards LTD. Well, that's what his LinkedIn profile says anyway!
The man who was named players' player of the year at the end of the double-winning season, retired from rugby last summer and now works as a player liaison officer for the Rugby Players' Association.
Always had the makings of a good coach and so it turned out as he is now in charge of the forwards at Franklin's Gardens.
Joined Bedford Blues as a player-coach after leaving Saints in 2017 and after two years with the Championship club, the scrum-half has now become Master in charge of rugby at his former school, Barnard Castle in County Durham.
Has loved his time in England, most recently playing for Bath, but the utility back is now heading for a new adventure in Japan with Mitsubishi Sagamihara DynaBoars.
Recently suffered another leg break when playing for London Irish but he is confident of a quick recovery and hoping to square up to Saints in the Premiership next season.