Swansea City have been relegated from the Premier League on the final day of the season.
But while a late Gabriel Jesus goal downed the Saints, the Swans were unable to seal the three points that would have completed their great escape.
Andy King had briefly raised home hopes with an early goal, but Peter Crouch and Badou Ndiaye turned the tables on Swansea to seal their fate.
The Welsh club were promoted from the Championship in 2011, beating Reading 4-2 in a pulsating play-off final, but their stay in the top-flight has now come to an end.
Swansea finished 11th in their debut campaign. Indeed, prior to the 2017-18 season, the Swans had not finished below 15th. Their highest league finish came in 2014-15, under Garry Monk, as they ended the season in eighth.
The Swans join Stoke, their opponents on the final day, and West Brom in dropping through the trapdoor.
The club have endured a miserable season this term, winning just eight games, and tasting defeat 21 times.