The actress spoke of how painful it was even revisiting their split in her own 1994 autobiography, My Story, many years later: “It was extremely difficult for me to write and it’s even harder for me to talk about.”

Ann-Margret has spoken very little about Elvis over the years but explained why she had finally decided to discuss their relationship.

She said: “There’s been so much, for some reason, negative situations surrounding his name that I wanted to show the man that I knew – generous, loving, funny, talented, gifted – and only show complete respect.”

Ultimately, of course, Elvis’s relationship with Priscilla did not last.

Just a few weeks after their marriage, Ann-Marget married actor Roger Smith on May 8, 1967. The couple remained happily together for fifty years until he passed away in 2017.

VIVA LAS VEGAS IS ON BBC 2, SATURDAY AUGUST 14 AT 1.15PM