Celtic manager Brendan Rodgers said his side should have equalled their record Old Firm win after clinching a seventh successive Premiership title with a 5-0 thrashing of Rangers at Parkhead.
The Hoops' 7-1 League Cup final win over their rivals in 1957 is their biggest victory in the derby match, and the gap between the two sides was every bit as big on Sunday.
Odsonne Edouard, the 20-year-old striker on loan from Paris Saint-Germain, scored a first-half double with James Forrest adding a third before the break and midfielders Tom Rogic and Callum McGregor notching further goals.
Goalkeeper Jak Alnwick, making his Old Firm debut, made several good saves to keep the champions at bay and leave Rangers relieved they had not suffered further damage.
"We should have had seven but we will take five," Rodgers said. "Their keeper made some great saves.
"It was great tribute to the work of the players and the scrutiny that they are under. The performance was outstanding, if you think of what the players put into the game."
Rodgers said the title win was better than last year, when Celtic went unbeaten in 38 games.
They have lost to Hearts, Kilmarnock and Hibernian this season but the former Liverpool boss added: "To then to have had that season and to come into this season with virtually very little to break, and to go and perform like we have done for quite a number of games under pressure, we have done really well.
"I am really proud of the players. I don't think I could have asked for any more. There won't be too many atmospheres around the world like today.
"It was great to make supporters happy -- it was a special day for them."