According to Trooping-the-colour.co.uk, Trooping the Colour goes all the way back to the 17th century. In battle, soldiers needed to be able to recognize the other men on their side; so the colors of their regiment were "trooped" in front of them each day. Trooping was also something foot guards used to do every day in London as they mounted their horses.

Fast forward to today, and Trooping the Colour is part of the Queen's birthday celebration ever year. Until 1987, she would arrive by horse, dressed in the uniform of whatever regiment was being trooped, since the celebration rotates between them, says the website. These days, she arrives by carriage — an equally beautiful entrance. The parade is made up of more than 1,000 officers, 200 horses, 200 musicians, and drummers; afterward, the royal family meets on the balcony at Buckingham palace and watches the Royal Air Force fly through the sky.

According to Royal.uk, since the 12th century (if not earlier), the Crown declared ownership of all mute swans, which is a species of swan, in the country, due to their value as a fancy dish. Although they're not eaten anymore, the Queen has a Swan Warden which helps in the conservation of the species, explains Royalswan.co.uk. Since younger swans (called cygnets) are so fragile, the Warden serves to examine assess the health of them and make sure they're in good condition. Royal Swan Uppers wear the uniform of the Queen and row together with Uppers from other livery companies. Aside from swan upping for more practical purposes, it's also an event schools are invited to, encouraging children to be active in wildlife.

The royal family is very cognizant of tummy troubles, and thus avoids anything overly spicy or exotic, rare meat, foreign water, and perhaps most notably, shellfish, according to the BBC. This includes shrimp, crab, lobster, clams, oysters, and squid. While some people might have an allergy or sensitivity to shellfish, it's also possible to get shellfish poisoning — more commonly in the summer months, according to MedlinePlus. Symptoms include stomach cramps, nausea, vomiting, and headaches. While shellfish poisoning typically isn't very serious, the royal family knows you can never be too careful!

Royal.uk explains there aren't technically any rules when meeting a royal, but a lot of people like to take the traditional route anyway. Before you throw your arms around the Queen or another member of the family for a big bear hug, you might want to stick with a neck bow (for the gents) or a small curtsy (for the ladies). While the media have lambasted people for breaking tradition and touching royals in more "intimate" matters — like when LeBron James put his arm around Kate Middleton, The Atlantic reminds us — this is one of those traditions where there's a bit more leeway, particularly because we Americans tend to be the touchy-feely bunch, and sometimes, well, you can't help but high-five a royal. Amirite? Even Meghan Markle has broken royal protocol and handed out hugs.

While we're all obsessing over Prince Harry and Meghan Markle's May wedding, there's one detail some people don't know: they had to get permission to get married first, due to the Royal Marriages Act of 1772, explains BBC America. The Queen reserves the right to declare any marriage a no-go, should she not like the person (obvi not a problem with M.Mark). According to the BBC, it's never happened; and supposedly, rules have softened. People says as of 2015, only the first six people in line to the thrown have to get permission from the Queen to wed. (For reference, Prince Harry is fifth in line.)

Instead of celebrating Christmas at Buckingham Palace, the royal fam heads to Sandringham House in Norfolk, says Royal.uk. Gifts are exchanged on Christmas Eve during teatime, as opposed to Christmas Day. Oh, and as for sending out Christmas cards? If you thought your list was lengthy, you ain't seen nothing yet. The Queen and Duke of Edinburgh mail out about 750, plus another 200 from the Duke specifically.

Tradition touches many aspects of the royal family, and that even includes their wardrobe choices. Have you ever noticed how the Queen is always wearing bright colors? This isn't on accident, or just because she likes to jazz things up. It's a habit she's gotten into so that when she's in large public gatherings, people can easily spot her, Sophie, Countess of Wessex explains in the documentary The Queen at 90, via PopSugar. Let's be honest: she looks pretty darn good, too. Then there are her gloves, which she's not often seen without. The BBC explains it's not just a fashion statement; it's also to protect her from germs as she shakes countless hands.

While the Queen might wear colors that pop, don't expect to see the same on her nails. Royals must stick to muted and natural colors, Bustle reported in a previous article. In fact, the Queen has been using the same colors for nearly 30 years. (This one.)

Even the little ones have to follow traditional fashion. Look at the adorable Prince George, who's always dressed in a stylish pair of shorts and knee-highs — a tradition dating back to the 16th century. While he does indeed look 50 shades of precious, he's dressed this way because royals can't wear trousers until about the age of eight, which signals manhood approaching. They also symbolize his aristocratic status, says etiquette expert William Hanson to Harper's Bazaar.