The Crown shows the Queen (Claire Foy) and Prince Philip (Matt Smith) struggling with their marriage as the young Duke finds it difficult to cope with life in his wife's shadow.
The pair have an explosive row over Elizabeth's relationship with her racing manager Porchey (Joseph Kloska), with whom she shares a close bond.
In a tense scene the Queen tells Philip: "I have nothing to hide from you. Porchey is a friend. And yes, there are those who would have preferred me to marry him, but to everyone's regret and frustration the only person I have ever loved is you."
In real life the Queen and Porchey were close friends, which sparked rumours that the two were having an affair. But was there any truth to the gossip?
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Did the Queen have an affair with Porchey?
As a young lady, Elizabeth was said to have had a list of “flirts” which included her friend Porchey.
“She clearly found him sexually attractive,” a lady-in-waiting told The Daily Telegraph’s Graham Turner.
In the late 1950s, it was suggested that Porchey might be the father of Prince Andrew, who was born on February 19, 1960.
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The Queen was close friends with Lord Porchester
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Gossips at the time claimed that Andrew had been conceived while Philip was on an overseas tour in early 1959. In fact, the dates did not match up for this to be true, and Andrew was conceived after Philip's homecoming.
Buckingham Palace has never commented on the rumours, but it is generally accepted that the two were nothing more than firm friends.
Porchey had married an Anglo-American noblewoman Jean Margaret Wallop on January 7, 1956.
The couple had three children – Henry, Carolyn and George – the current Earl of Carnarvon who the Queen was pictured holding at his christening.
Porchie was employed as the Queen's racing manager
The Queen attended Porchie's son's christening
Porchey died of a heart attack on September 11, 2001 on the same day that thousands were killed in the New York terror attack.
The Queen wrote in a message read at a remembrance service for the 9/11 victims: “Grief is the price we pay for love.”
Her uncharacteristically sentimental words were seen by many as a reference to her own personal grief at losing her friend Porchey.
She would later attend his funeral, something the monarch does not usually do.
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The Queen pictured in December 2016
Who was Lord ‘Porchey’ Porchester
Lord Porchester was born Henry George Reginald Molyneux Herbert, Baron of Porchester.
He was known to friends as Porchey on account of his title and became the seventh Earl of Carnarvon upon the death of his father, also named Henry, in 1987.
Henry senior was a close friend of King George VI and introduced Porchey to the then-Princess Elizabeth when the pair were young.
The pair bonded over a shared love of horses and in 1969 the Queen appointed Porchey as racing manager, a role he held until his death.
The Queen was friends with Porchie until his death in 2011
Porchey was first introduced to horse on a stable visit to Beckhampton with his father in 1942. It was here that he first met the young Princess Elizabeth.
After studying at Eton, Porchey served in the Royal Horse Guards.
He went on to attend the Royal Agricultural College and became a successful horse breeder.
In 1964 he was elected to the Jockey Club and was chairman of its race planning committee from 1967 until 1985.