Sir Michael.
His widow Lady Gambon and son Fergus said their “beloved husband and father” died peacefully in hospital with his family by his side, following a bout of pneumonia.
Sir Michael’s family had moved to London when he was a child but he made his very first stage performance in Ireland, in a production of Othello in Dublin in 1962.
His career took off when he became one of the original members of Laurence Olivier’s National Theatre acting company in London. He went on to win three Olivier awards for performances in National Theatre productions.
Dame Helen Mirren – who starred with him in 1989’s The Cook, the Thief, his Wife and her Lover, led tributes to her “naughty but very, very funny” friend.
In an interview for this weekend’s Sunday with Laura Kuenssberg, Dame Helen recalled how he had kept her “constantly in laughter” during filming and also when they appeared on stage in Antony and Cleopatra seven years previously.
She added that in recent times the two had discussed growing older, and how that affected their work:
Sir Michael was “utterly realistic” about his situation, she said. “He found it increasingly difficult to remember lines, which I have the greatest of sympathy with, and that sort of took him away from theatre,” she said.
‘Magnificent trickster’
He played French detective Jules Maigret in ITV series Maigret and was also known for his role as Philip Marlow in Dennis Potter’s The Singing Detective on the BBC.
Sir Michael took on the role of Dumbledore – headmaster of wizarding school Hogwarts – in the hit Harry Potter series, based on JK Rowling’s novels, after the death of Richard Harris in 2003.
Fiona Shaw, who played Petunia Dursley in the films, told BBC Radio 4’s The World at One: “He varied his career remarkably and never judged what he was doing, he just played.”
She said she would always think of him “as a trickster, just a brilliant, magnificent trickster”, adding: “With text, there was nothing like him. He could do anything.”
Jason Isaacs, who played Lucius Malfoy in the series, wrote on social media: “I learned what acting could be from Michael in The Singing Detective – complex, vulnerable and utterly human.
“The greatest thrill of being in the Potter films was that he knew my name and shared his fearless, filthy sense of fun with me.”
And James Phelps, who played Fred Weasley in the films, called Sir Michael “a legend” in a tribute on X, formerly known as Twitter.
He also shared a screenshot of text of him recalling Sir Michael once offering to go over lines one weekend when he had a part in Peter and the Wolf with the Manchester Halle Orchestra.
“We spent what should have been his downtime going over my weekend gig. It is a memory that I’ve always had as one of the highlights of my (Harry Potter) days,” he said.
Dame Joan Collins, who played Sir Michael’s wife in BBC sitcom Mama’s Back in 1993, called him a “great actor and great fun”.
Dame Eileen Atkins, a longstanding friend of Sir Michael, told BBC Radio 4’s The World at One he was “a great actor, but he always pretended he didn’t take it very seriously” and that he had amazing stage presence.
“He just had to walk on stage and he commanded the whole audience immediately,” she said. “There was something very sweet about him, this huge man who could look very frightening – but there was something incredibly sweet inside Michael.”
His other film work includes the big screen adaptation of Dad’s Army, Gosford Park and the King’s Speech, in which he portrayed King George V, father of the stammering King George VI.
He was nominated for Emmy awards for his role as Mr Woodhouse in an adaptation of Jane Austen’s Emma in 2010, and for playing President Lyndon B Johnson in Path to War in 2002. He also got a Tony nomination in 1997 for a role in David Hare play Skylight.
He was knighted for services to the entertainment industry in 1998. Although Irish-born, he had become a British citizen in his childhood.
The actor, known as “The Great Gambon” in acting circles, had last appeared on stage in 2012 in a London production of Samuel Beckett’s play All That Fall.
American actor Ryan Phillippe said he felt “so lucky” to work with Sir Michael on Gosford Park. He recalled that Sir Michael was in his 60s at the time and he was only 25, but they “got along like schoolmates due to his irrepressibly youthful spirit”.
“The car rides home from work, in his vintage convertible, at breakneck speed, with the Stones full volume on the radio, will stay with me forever.. Rest in peace, mate,” he said in a post on X.