Lady Jane Spencer’s sister was the first to wear it in 1978. Two years later, Diana’s sister, Lady Sarah Spencer, wore the diamond-studded tiara when she “I do.” Finally, Sarah’s ...

Said to date back to the 18th century, it was presented to Diana’s grandmother, Cynthia, Viscountess Althorp, by distant relative Lady Sarah Spencer as a wedding gift in 1919.

The new episodes, which cover the period from 1977 through 1989, will introduce viewers to Lady Diana Spencer, as she was then known, and will include her wedding to Prince Charles.

On this day in 1981, the wedding of the century took place.Lady Diana Spencer and Prince Charles said their "I dos" at St. Paul's Cathedral in London. Around 3,500 guests were in attendance at the ...