"He was one of a kind in the very best sense and a giant in his field," Kenis said. The hell-raising icon of stage and screen was nominated for eight Oscars before finally being given an honorary award in 2003. Irish President Michael D Higgins said it was "with great sadness" that he heard of O'Toole's death.
"Ireland, and the world, has lost one of the giants of film and theatre," he said in a statement. The son of an Irish bookmaker, O'Toole was born in 1932 and raised in northern England.
After working briefly as a journalist and a radioman for the Royal Navy he went to study at the prestigious Royal Academy of Dramatic Art, in a class that included future stars Albert Finney, Alan Bates and Richard Harris. After making a name in theatre, his big break arrived in the form of David Lean's 1962 desert epic "Lawrence of Arabia".
Bollywood celebs show you colours for Navratri 2017
Photos: Kareena Kapoor Khan, Kangana Ranaut at the Mumbai airport
Birthday special: Chris Gayle and his multiple records in cricket
In Pictures: 17 dreaded on-screen villains of Bollywood
'Ramayan' director's great granddaughter Sakshi's hottest photos