Manchester United great David Beckham welcomed his old club's Europa League triumph as a way of bringing "a little happiness at a difficult time".
Pogba leads Utd to emotional win
The build-up to Wednesday's match was overshadowed by the tragedy of Monday's terror attack on the Manchester Arena that left 22 victims dead and dozens more injured.
A minute's silence preceded kick-off at Friends Arena, before United went on to defeat Ajax 2-0 thanks to goals from Paul Pogba and Henrikh Mkhitaryan.
Fierce rivals Manchester City tweeted #ACityUnited at the final whistle in a show of solidarity following a desperately tough few days for the city, and Beckham likewise believes that United's win went beyond footballing success.
Writing via his official Instagram page, the ex-England captain said: "Tonight was more important than sport...
Man Utd complete historic treble
"Yes, a big night for Manchester United but an even bigger night for the city and for our country...
"At a time when we are grieving for the families that have lost loved ones we have a sport that has bought a little happiness at a difficult time... We pray for peace."
United's triumph – their first in this tournament – means they will qualify for next season's Champions League.
It is the second time that manager Jose Mourinho has lifted the trophy, following his success with Porto in 2003.
