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Together, they racked up 11 films, countless explosive rows and 12 marriages - including two to each other.
Yet, touchingly, Elizabeth Taylor still keeps a photo of her former husband Richard Burton by her bedside.
And according to the 77-year-old actress, had Burton been alive today, the Hollywood couple would have wed for a third time.
Burton's niece, Sian Owen, said: 'I was in America last summer and I went to see Elizabeth.
'In the house in Bel Air I saw pictures of Uncle Rich everywhere and it's a picture of him that's by her bed still.
'She still says that had he lived they'd be back together once again - that it would have been third time lucky. They were mad about each other. They were soul mates. It was a great love story.'
The pair fell in love during the making of 1963 film Cleopatra, in which Taylor played the Egyptian queen and Burton was cast as Mark Antony.
They married 12 months later and stayed together for ten years. But after years of high living, and Burton's drinking and hell-raising, they divorced in 1974.
Less than a year later they remarried but divorced once again after just 11 months.
Despite this, the pair remained close and when Burton died unexpectedly of a brain haemorrhage in 1984 aged just 58, his widow Sally banned Taylor from attending the funeral.
Sian revealed: 'Even when he was married to Sally and living in Switzerland, he would talk for hours on the phone with Elizabeth. I would say to Sally that I would never put up with that but she didn't have much choice.'
Sian, 60, spoke out after it was announced a film festival will be held in Denbigh, Wales, to mark the 25th anniversary of his Burton's death.
She said: 'I had a fantastic time with them, especially the Elizabeth years - it was great love story. There's a huge interest in him even 25 years after his death but he was more than a great actor.
'I was in his company a lot and he always held the floor even at dinner parties with the likes of John Gielgud and Larry Olivier. There was something magnetic about him, he was a wonderful raconteur.
'He always took a true story and stretched it a little bit to make it a bit more interesting for people.'
Burton's film career included Cleopatra and Who's Afraid of Virginia Woolf? - both co-starring Elizabeth, who is now 77. He was nominated for an Oscar seven times but never won. He was knighted in 1970.
Vesi Jones, the Chair of the Denbigh Film Club, said: 'Richard Burton was a true Hollywood superstar and his tempestuous relationship with Elizabeth Taylor was worthy of a classic celluloid love story.
I'm loving Liz here.