When Kensington Palace announced the trip, it referred to William and Kate as the Duke and Duchess of Rothesay, using the royal titles they go by in Scotland. The Duke of Rothesay is the traditional title for the male heir to the Scottish throne and has been since 1469, making his wife the Duchess of Rothesay — but that's not all.

Kate Middleton joined husband Prince William for the couple’s royal visit to Scotland on Tuesday. The Prince and Princess of Wales kicked off a two-day visit to the Isles of Mull and Iona. Tuesday’s outing also falls on the same day as the royal couple’s 14th wedding anniversary.

Prince William and Kate, the Princess of Wales, celebrated their 14th wedding anniversary Tuesday in Scotland, the country where they fell in love.