Brendan Rodgers says growing up as a Celtic fan has made his success with the club even more special.
Despite failing to do it unbeaten as they did in 2016-17, the Hoops retained their Scottish League, Cup and League Cup titles to give Rodgers a second domestic clean sweep in his two seasons at the club.
However, while Rodgers took great personal pride the first time around, he has enjoyed tapping into the joy of the fanbase he knows so well, having supported the club as child, during their second treble-winning campaign.
"Last year felt like a dream, winning the treble in my first season - and this season was just remarkable really and historical," Rodgers told the Celtic View.
"For me, it's seeing the happiness of everyone else. People ask what it means to me but I grew up as a Celtic supporter and seeing what it means to people gives me the joy - seeing children, women and men, granddads and grandparents, all smiling and being so happy and being on the streets.
"That gives me the joy, as does the happiness of the players, knowing they've achieved something and added something more to their profile, and that's ultimately what I'm here to do.
Having defeated Motherwell in the Scottish League Cup final and cruised to a seventh consecutive league title, Celtic saw off the same opposition once more on May 19.
Around 15,000 supporters spilled onto the streets of Glasgow's east end in the hours after their 2-0 win as the Celtic squad embarked on an open top bus parade to show off this season's haul.
"It was a really special day for everyone," Rodgers said. "It was a great day for Celtic. You think of the whole history of this great football nation, players and managers, and to be the first team to do it back-to-back is a phenomenal achievement.
"My thoughts are more with the supporters, the players, all the staff and the board that brought me in a couple of years ago. I'm so happy for them that they can really enjoy this.
"It's for the supporters. We can be nothing but inspired by the Celtic support and their commitment to us - wherever we go, they're always there. To give them a day like that, and overall a moment in history, gives me the real satisfaction.
"This is something we'll never forget. Saturday, May 19, 2018, was the day Celtic created football history in Scotland."