We’ve taken a look back at the morning of July 28, 1981, on which Diana (20 years old at the time) and Charles (32 years old at the time) exchanged their vows in a ceremony that even then was being called the ‘wedding of the century.’ Click through to the slideshow to find out about the secret symbol embroidered into the petticoats of Diana’s wedding gown, how she caused an uproar with her modification of the traditional wedding vows, how long it took bakers to create the couple’s five-tier wedding cake, and more! Check out:Prince William PhotosPrince William Loves His Blue SweaterKate Middleton’s Style EvolutionMeghan Markle Maternity StyleAll About Prince Harry and Meghan Markle’s Wedding