Chris Jackson/Getty ImagesHappy birthday, Queen Elizabeth II!
The British monarch, grandmother of Prince William and Prince Harry, turned 90 Thursday. She has been on the throne for 64 years and is the oldest monarch in U.K. history.
Check out answers to seven frequently asked questions about the queen.
1. Does Queen Elizabeth II have a last name? According to the History Channel, her father, King George VI, was born into the House of Saxe-Coburg and Gotha. During World War I, the family name was changed to Windsor amid anti-German sentiment.
When the queen signs her name, she writes "Elizabeth R." R stands for Regina (queen).
In addition, during her engagement to Prince Philip, her husband-to-be dropped his father's Germanic surname, Schleswig-Holstein-Sonderburg-Glücksburg, and adopted the last name of his maternal grandparents, Mountbatten. After Elizabeth ascended the throne, several of her descendants used the last name Mountbatten-Windsor. Among them: William and his wife Kate Middleton, aka Catherine, Duchess of Cambridge.
2. Does Queen Elizabeth II have a nickname? Her husband has called her "Sausage" and "Cabbage" throughout their 68-year marriage. Growing up, she was known as "Lilibet."
3. How rich is the queen and the Royal Family? According to Reuters, in 2015, the monarchy had nominal assets worth 22.8 billion pounds ($32.7 billion), made up of the Crown Estate, the duchies of Lancaster and Cornwall and the Royal Collection. The family owns royal residences such as Buckingham Palace and Windsor Castle—which the public can visit for a fee, the queen's private estates of Sandringham and Balmoral, other rural properties spanning about 340,000 acres across England, Wales and Scotland, paintings, antiques and jeweler valued at over 10 billion pounds and, of course, the famous Crown Jewels.
4. What's with the queen's husband—why is he a "prince" and not a "king?" As the husband of a queen, Philip is known as a Prince consort. He is also known as the Duke of Edinburgh.
5. Hey, aren't the queen and her husband related? Yes, Elizabeth and Philip are third cousins. They are both great great grandchildren of Queen Victoria and husband Prince Albert, who were themselves first cousins who shared the same grandmother—the Dowager Duchess of Coburg. Philip is the nephew of Greece's King Constantine I and was born on the Greek island of Corfu.
6. Does the queen use the Internet? She may be 90, but Elizabeth is no stranger to technology. She even sent an email way before you—in 1976, to be exact, at a network technology demonstration at the Royal Signals and Radar Establishment, a research facility in Malvern, England. According to the History Channel, the message was transmitted over ARPANET. The queen did join Twitter a bit late—she posted her first tweet in 2014 via the @BritishMonarchy account in front of 600 people at a celebration of a new Information Age gallery at London's Science Museum.
7. What's with all the corgis? The queen has owned more than 30 Corgi dogs since she was a child. She currently has two Pembroke Welsh Corgis, Willow and Holly, and two Dorgis, or corgi-dachshund cross-breeds, named Candy and Vulcan, who often travel with her.
Her father introduced the corgi breed to the Royal Family in 1933 when he bought one named Dookie from a local kennel, according to her family's website. They then acquired a second corgi, Jane, who had puppies. They kept two of them—Crackers and Carol. When she turned 18, Elizabeth was also given a corgi named Susan and she produced more corgi "heirs."
The queen's corgis have inspired their own official Royal Collection gifts for purchase—you can buy plush dogs and fuzzy slippers.