The victory, built on a stifling physicality and suffocating defence, extends Wales' winning run to 14 games. Captain Alun Wyn Jones was again at the heart of the performance and says they are happy to embrace their role as one of the favourites for the World Cup.
"Belief is something you have to earn and we are doing that," Jones, who became just the sixth player to have won three Grand Slams, said. "We have put a big target on our back for a lot of other teams and you have to be comfortable with the pressure that comes with that."
Gatland has yet to confirm his plans after the World Cup, but has been linked as a possible successor to England head coach Eddie Jones. Gatland could not resist sniping back at Jones, who this week had questioned whether Wales were too tired to complete a Grand Slam.
"It was a fantastic performance, we didn't look too tired did we?" said Gatland. "We spoke beforehand about the players playing for themselves, their families and the fans and being able to create a bit of history. You can never take that away from them now.
During the trophy presentation, the New Zealander appeared emotional in his final competitive game at the Principality Stadium after an 11-year tenure as Wales head coach. He hopes that he has left a legacy that his successor, Wayne Pivac, can build upon.
"I am pretty proud of what this coaching and management team have achieved," Gatland said. "It's pretty special. Sitting somewhere next year watching the Six Nations, it'll be something I miss.
"But having been involved here so long, I just hope they can continue what we've done in the last 10 or 12 years in terms of putting some respectability back in that jersey."
