Renata believes his success in England has allowed her son to finally put that disappointment behind him.
"I have to admit, I did not expect him to win with Leicester. He found these players... they are good lads. He told me they always trained as real professionals," Renata said in an interview with the Italian newspaper La Repubblica.
"Naturally it wasn't a big squad full of champions. I know that he's happy in England, they always treated him perfectly. He rediscovered himself there.
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"In my view, at Roma he was not treated with respect. In the family we are all Giallorossi fans. We were disappointed with the way things ended... Now he's 'King of England', imagine that."
Renata also said her son was careful to take care of his dietary needs in the weeks leading up to the East Midlands club winning their first English league title.
"My son needs to stay fit, so he almost never opts for a 'primo' (the plate of pasta that traditionally kicks off an Italian meal)," the 96-year-old said.
"Instead, he has green beans or a salad... Before leaving, he ate strawberries with lemon and sugar"
Leicester host 11th-placed Everton in the league at the King Power Stadium on Saturday, after which they will be presented with the Premier League trophy.
(Reporting by Shravanth Vijayakumar in Bengaluru; Editing by John O'Brien)
