In general, Prince William and his grandmother, Queen Elizabeth, are pretty much on the same page. However, eleven years ago this month, leading up to the April 29, 2011 wedding of Prince William and his bride, Kate Middleton, Prince William and Queen Elizabeth clashed over a wedding detail: his outfit.

William initially wanted to wear the Irish Guards frock coat he had worn to previous royal functions. However, he had been commissioned a colonel in his regiment two months before the wedding, and Her Majesty the Queen wanted him to wear a red tunic.

"We discussed the matter several times, but as I learned in my childhood, you must not interfere with your grandmother," the Duke of Cambridge said, according to the Mirror. (Even though her attire was the focus of much attention among the Duke and Duchess of Cambridge, it is really hard to imagine William wearing anything other than a red tunic.)

And while the Queen did not relent on William's attire, she was more generous in other aspects of the wedding preparations. After William was given the first guest list, the Queen allowed William and Kate to make their own guest list.

"Things were quickly gaining momentum for the wedding," William said in 2012, the year after the ceremony. "At our first meeting we were given a list of 777 people, and not one of them was anyone we knew. It was a little daunting, and it was like this was the full list of invited guests, and there was no room for friends and family."[9

However, after the Queen's call, she was willing to allow her grandson and heir to the throne the chance to reflect on the guest list the people who really mattered to him and his bride.

"I wasn't too happy, so I called [the queen] for moral support and a little backup," William said. She said, 'Don't be so silly. Drop the list and start with your friends.'"