Elvis and Priscilla Presley's 1967 marriage certificate is estimated to sell for $40,000-60,000 in a major auction of the star's memorabilia at Graceland.

Accounts vary on how the wedding came about, with some suggesting that Presley was pressured into the marriage by Priscilla and her family, after they had threatened to take their story to the press (she was just 14 when they met).

Elvis and Priscilla Presley were married in Las Vegas on May 1, 1967

The ceremony took place in Las Vegas and lasted all of eight minutes.

The certificate was mailed to the couple, but was sent back to the registration office stamped "Return to Sender".

One of the clerks kept it for many years before selling it on in 1995.

We have this incredible signed photograph of Elvis taken during his years in the army.

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