Two major events in recent Welsh history will be featured in one of the world’s biggest shows as The Crown series three airs this weekend.
The drama, which documents the life of the Royal Family, will show the Queen's response to the Aberfan tragedy, as well as the investiture of Prince Charles at Caernarfon Castle.
The Aberfan disaster killed 116 children and 28 adults when coal slurry gave way on a hillside behind a primary school in 1966.
The Queen travelled to the village days after the tragedy and met with parents and children whose family members had been killed.
One onlooker who saw the filming, said: "It was all very dignified, Olivia Colman is clearly taking her role very seriously.
"There was a very sombre mood. I think everyone involved in the production realises what an awful tragedy Aberfan was."
Colman told the Radio Times it was the “hardest thing ever” to film and to “play someone much stronger emotionally than me."
Jeff Edwards - who was aged eight at the time of the disaster - was the last survivor to be pulled from the rubble.
He, and others from Aberfan, were consulted on the episode.
"It portrays the disaster very well. It gives factual detail of how the disaster happened, and the impact on the community."
"The only disappointing part from my perspective was the way they portrayed the Queen - as very callous and not caring."
"That really wasn't the case - and certainly isn't the case - on the number of times that I've met the Queen".
Mr Edwards added that Netflix has offered counselling and support to members of the community who might be affected by the depiction of the disaster, which he says is "a big, big move".
Jason Watkins, who plays the role of the prime minister Harold Wilson in the series, told ITV’s Lorraine he struggled to film the Aberfan episode after losing a child himself. His daughter, Maude, died from sepsis when she was two-and-a-half.
“It’s an incredibly moving film - and we filmed not far from Aberfan. Care and attention was taken by everyone in production.
“People probably know I lost a child in 2011 so to go and have an episode about the loss of a child was very difficult and I suppose, above anyone else, perhaps wanted to make it in the right way.
“But I think it does help us to remember what happened. Previous generations are probably not as aware of that terrible tragedy. Because it is such a big show, the whole world focuses and remembers that terrible tragedy so I’m very proud to be a part of that, however difficult that was.”
Colman took over the role of the monarch from Claire Foy who played Queen Elizabeth in series one and two.
The episode also shows the Prince of Wales, who is played by Josh O’Connor, arriving at Aberystwyth University to learn Welsh in preparation of his ceremony.
When asked about his Welsh pronunciation during the series three world premiere, co-star Erin Doherty, who plays Princess Anne, said it was “brilliant,” and that he was told to “stop being so good.”
The third series will cover historic events from 1964-1976 including the moon landings and a build up to the arrival of Princess Diana.
It was shot back to back with the fourth series and will be released on Netflix on Sunday.