Prince William reveals becoming a parent brought back painful memories of Princess Diana's death

The Duke of Cambridge said he found becoming a father "overwhelming" at times (Getty Images)

Prince William has today been thanked by the Archbishop of Canterbury for encouraging him to seek help for depression.

However, the Duke of Cambridge, 37, will open up this week in a new documentary about his own mental health.

The father-of-three has revealed that becoming a parent brought back painful memories of Princess Diana's death.

Speaking in BBC One's Football, Prince William And Our Mental Health, which will be air on Thursday evening, he admitted finding things "overwhelming" as the "traumatic" event from his teenage years resurfaced.

The royal father-of-three was 15 when he lost his mum (the pair pictured in 1995 with Prince Harry) (Getty Images)

The duke was 15 years old when his mum passed away following a car crash in Paris in 1997.

In the upcoming programme, former professional footballer Marvin Sordell told him that becoming a dad had been "the hardest time in my life", having not grown up with a father figure.

The royal replied: "Having children is the biggest life-changing moment, it really is.

"And I agree with you, I think when you've been through something traumatic in life - and that is like you say your dad not being around, my mother dying when I was younger - your emotions come back in leaps and bounds because it's a very different phase of life.

"And there's no one there to, kind of, help you, and I definitely found it very, at times, overwhelming."

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Prince Harry and Prince William
The Prince and Princess of Wales and their two children, Prince William, 9, and Prince Harry, 7, wave goodbye from the deck of the Royal Yacht Britannia to the people of Toronto at the end of the Royal couple's five-day official visit to the city.
The Prince of Wales arrives at Aberdeen rail station on his way to the Royal Family's retreat at Balmoral. He took his two sons, six-year-old Prince William, left, and four-year-old Prince Harry, accompanied by their nanny Ruth Wallace.
Princess Diana, Princess of Wales with Prince William and Prince Harry on holiday in Majorca, Spain on August 10, 1987. Also present were the Spanish Royal Family and Prince Charles, Prince of Wales.
Princes William and Harry are swamped by dogs at the Badminton horse trials. Royals, Full length, Animal, Dog, William, Harry ©Anwar Hussein/allaction.co.uk
Six year old Prince William shields his eyes from the Spanish sunshine as he poses for photographs on the steps of the Marivent Palace with his brother Prince Harry, mother The Princess of Wales (lower right), and father the Prince of Wales (left). With them are King Juan Carlos (centre) and Queen Sofia of Spain and their children the Infantes Cristina and Elena and Prince Felipe.
The Prince and Princess of Wales on holiday with their sons, Prince William and Prince Harry (riding pillion behind his father), on Tresco, Scilly Isles.
The young Princes William and Harry at the Polo. Photo. Anwar Hussein
Prince William, along with the Duke of Edinburgh, the Earl of Wessex, the Queen, the Princess Royal, the Prince of Wales, Prince Harry and the Princess of Wales look on from the balcony of Buckingham Palace at Trooping the Colour. Royals, Philip, Queen, Minor Royal, Edward, Anne, William, Charles, Diana, Balcony, Family shot, Half length, Uniform, Hat. ©Anwar Hussein/allaction.co.uk
The Princess of wales follows her sons Prince Harry (right), five years old, and Prince William, seven, on Harry's first day at the Wetherby School in Notting Hill, West London.
The Princess of Wales rides a chair lift up the Kriegerhorn with her sons Prince William, left, and Prince Harry, in Lech, Austria.
THE PRINCESS OF WALES DRIVES HER SONS, PRINCES HARRY & WILLIAM AWAY FROM KENSINGTON PALACE.
PRINCE WILLIAM (LEFT) AND HARRY ARRIVING AT HEATHROW FROM ABERDEEN TODAY. ALSO PICTURED IS ROYAL NANNY, TIGGY LEGGE-BOURKE.
The Princess of Wales, accompanied by Prince William and Prince Harry, arrives at the Queen's Medical Centre to visit Prince Charles.
Princes William and Prince Harry with the Diana, Princess of Wales in Austria during their 1992 skiing holiday. At the time the Princess was going through her break up with Prince Charles, Prince of Wales.
The Prince and Princess of Wales, with young Prince William and Harry at the wedding of Duke Hussey's daughter in Bath, May 1989. Photo. Anwar Hussein
Prince William signs the traditional Entrance Book watched by his parents, the Prince and Princess of Wales, and younger brother, Prince Harry, at Eton College.
Diana, Princess of Wales with young Princes William and Harry at Niagara Falls, Canada in 1991. Photo. Anwar Hussein
The Prince of Wales and his sons, Princes William (left) and Harry, leave church this morning (Sunday).
The Prince and Princess of Wales with sons Prince William (right) and Prince Harry, attending the VJ Day commemorations at Buckingham Palace.
(L-R) The Prince of Wales, Prince William and Prince Harry looks on as Queen Elizabeth The Queen Mother waves to the crowds outside Clarence House, London, on the day of her 101st birthday. *31/08/01 The fourth anniversary of the death of the princess was, being marked privately by her sons William and Harry. The teenage princes and their father, the Prince of Wales, would remember her in their own way, said St James's Palace. Charles was finishing his autumn holiday at Birkhall on the Balmoral estates in Scotland, and William was understood to be in Scotland too. As in the two previous years, there are no official plans to commemorate the day Diana died in a Paris car crash in 1997.
Note to Editors: This picture transmitted 17 August 1998 to accompany package of stories in advance of the first anniversary of the death of Diana, Princess of Wales. Library filer dated 6/9/97 of (L-R) The Duke of Edinburgh, Prince William, Earl Spencer, Prince Harry and the Prince of Wales following the coffin of Diana, Princess of Wales, to Westminster Abbey for her funeral service. Photo by Adam Butler/PA/WPA ROTA.
Prince William, Prince Harry and Prince Charles, Prince of Wales attend the Service to celebrate the life of Princess Diana, Princess of Wales at the Guards Chapel in London.
The Prince and Princess of Wales with sons Prince William, right, and Prince Harry relaxing in Tresco during their holiday in the Scilly Isles.
Princes William and Harry at Cirencester Polo Club in 2001. Photo. Anwar Hussein
The Earl of Spencer, Prince William, Prince Harry and Prince Charles at the funeral of Diana, Princess of Wales in September 1997. Photo. Anwar Hussein
The Prince and Princess of Wales, with Princes William (centre, r) and Harry, at the VJ Commemorations at Buckingham Palace.
The Prince of Wales and his sons Princes Harry and William (R) leave church on the Sandringham Estate after the traditional Christmas Day service, attended by the Queen and other members of her immediate family.
The Prince of Wales flanked by his sons Princes William (left) and Harry during a photocall at Prince Charles country home, Highgrove Estate in Gloucestershire, at the beginning of the two young princes summer holidays. * Earlier Prince William, 17, arrived for the photocall at a wheel of car in which he his learning to drive.
The Prince of Wales followed by Princes Harry and William arrive for the BBC Songs of Praise Millennium Service at the Millennium Stadium in Cardiff.
The Prince of Wales and his sons, Prince William (left) and Prince Harry, pose for photographers on the Madrisa ski slopes above Klosters. They are on the third day of their traditional skiing holiday in Swiss resort.
The Queen Mother stands with Queen Elizabeth II, and great grand children, Prince William and his brother Prince Harry on the balcony of Buckingham Palace, for her celebrations on her 100th birthday.
Left-right: Prince Harry and Prince William after their Highgrove polo team beat Cirencester Park in the ladbrokescasino.com trophy at Cirencester Park Polo Club.
Princes William and Harry at the Queen Mother's funeral at Westminster Abbey, London in April 2002. Photo. Anwar Hussein
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The duke acknowledged that emotions can "come out of the blue".

He added: "It's one of the most amazing moments of life but it's also one of the scariest."

Along with Kate Middleton, 38, he is father to son Prince George, six, daughter Princess Charlotte, five, and two-year-old son Prince Louis.

The duke has previously opened up about how his mental health was affected by his mum's death.

In another BBC documentary, broadcast last year, he said: "I've thought about this a lot, and I'm trying to understand why I feel like I do.

"But I think when you are bereaved at a very young age, any time really, but particularly at a young age, I can resonate closely to that, you feel pain like no other pain."

He also noted that his former job as an air ambulance pilot "tipped him over the edge", partly because he worked "several times on traumatic jobs involving children".

The duke explained that having his own family caused him to feel "very sad and very down".

- This article originally appeared on Yahoo!.

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