The 69-year-old actor, who rose to fame in 1982 with late Lord Attenborough's Oscar-winning blockbuster 'Gandhi', says there is a poignant reason he treasures the knighthood he won in 2002, reported Daily Mirror.
"My mother refused to acknowledge my knighthood, which I found bitterly hurtful. The wonderful woman who is the Queen and who is almost like a mum had said, 'We accept you and love what you do'. But my mother refused to acknowledge it had taken place. She was embarrassed and bitter and jealous," Kingsley said.
Kingsley was born Krishna Bhanji in the East Riding of Yorkshire, son of a Kenyan-born doctor of Indian descent who moved to the UK to study medicine.
His "smoking, drinking" father died aged 54 and his mother at 96 in 2010.
Kingsley's pride in his knighthood was also heightened by the "steady stream" of racism he suffered over the years.