The Crown: Series four release date is REVEALED as teaser reveals glimpse of Princess Diana

The release date for The Crown's long-awaited fourth series has been revealed as fans got their first glimpse of Emma Corrin as Princess Diana on Thursday.

The 30-second preview hinted there could be dark times ahead for the monarchy as Olivia Colman's Queen Elizabeth II warns it is 'too important to fail.'

Despite concerns the fourth series could be delayed by the COVID-19 pandemic, the trailer confirms that The Crown's fourth series will be released on Sunday 15th November.

It's here! The release date for The Crown's long-awaited fourth series has been revealed as fans got their first glimpse of Emma Corrin as Princess Diana on Thursday

The brief preview features a voiceover of The Queen, as she emerges from Buckingham Palace on horseback, saying: 'Something as important as monarchy simple cannot be allowed to fail.'

It then cuts to a glimpse of Gillian Anderson as Prime Minister Margaret Thatcher, with the series set to begin in the late 1970s, at the beginning of her rise to power.

But a majority of the trailer focuses on Emma Corrin's depiction of Lady Diana Spencer, who would eventually become Princess Of Wales, one of the most iconic figures in Royal History.

Dark times ahead: The 30-second preview hinted there could be dark times ahead for the monarchy as Olivia Colman's Queen Elizabeth II warns it is 'too important to fail'

Divisive: Fans also get their first look at Gillian Anderson as Prime Minister Margaret Thatcher, with the fourth series set to begin in the late 1970s

The fourth series will document her blossoming romance with Prince Charles, as the trailer features the moment she emerges to greet an army of photographers, along with crowds cheering her name as she travels the world on behalf of the monarchy.

This includes Diana's 1983 tour of Australia, when she famously donned a beautiful fuchsia pink dress.

The preview ends with a glimpse of Diana's iconic David Emmanuel wedding dress, which will feature centre stage as The Crown recreates her historic 1981 wedding.

An official synopsis for The Crown Series Four reads: 'As the 1970s are drawing to a close, Queen Elizabeth (Olivia Colman) and her family find themselves preoccupied with safeguarding the line of succession by securing an appropriate bride for Prince Charles (Josh O’Connor), who is still unmarried at 30.

'As the nation begins to feel the impact of divisive policies introduced by Britain's first female Prime Minister Margaret Thatcher (Gillian Anderson), tensions arise between her and the Queen which only grow worse as Thatcher leads the country into the Falklands War, generating conflict within the Commonwealth.

'While Charles’ romance with a young Lady Diana Spencer (Emma Corrin) provides a much-needed fairytale to unite the British people, behind closed doors, the Royal family is becoming increasingly divided.'

Helena Bonham Carter will once again appear as Princess Margaret, while Tobias Menzies will play Prince Phillip.

Josh O'Connor will reprise his role as Prince Charles, expected to take centre stage this series due to his relationship with Diana.

More to Follow.