We’ve ogled the British Blue Shorthair, and admired the plush gray fur of the Chartreux from France. Now, it’s time for a crash course on Russia’s sleekest, most aristocratic-looking feline: the Russian Blue.

1. THE RUSSIAN BLUE LIKELY HAILS FROM NORTHERN RUSSIA.

The Russian Blue’s ancestral roots are lost in time. Some people speculate that they’re descended from the pet cats of Russian czars, but there’s probably more truth to the claim that the breed originated in northwest Russia. According to legend, the gray kitties lived in the wilderness, and were prized—and sadly hunted—for their dense, warm fur. Today, it’s said that gray cats resembling the Russian Blue still live in the country's coldest regions.

It’s believed that sailors brought the Russian from the port city of Arkhangelsk—which sits on the Northern Dvina River in the northwestern part of the country—to Great Britain and Northern Europe in the 1860s. The city was one of the most important ports in the Russian Empire. Its name means Archangel in English, which may explain why the Russian Blue was once known as the Archangel Blue. (Other early monikers include the Maltese and Foreign Blue.)

2. RUSSIAN BLUES WERE SHOWN AT ONE OF THE WORLD’S FIRST CAT SHOWS.

The “Archangel Cat” made an appearance at one of the world’s first cat shows, held at London’s Crystal Palace in 1875. The breed reportedly drew praises from one writer in attendance, who described it as "a very handsome cat, coming from Archangel … particularly furry …. They resemble mostly the common wild gray rabbit."

Sadly, the Russian Blue didn’t win any prizes: Harrison Weir—the show’s founder who’s today remembered as “the father of the cat fancy”—grouped all the short-haired blue cats into one category, and he preferred the stockier, round-faced British Blue.

3. THE RUSSIAN BLUE NEARLY DISAPPEARED DURING WORLD WAR II—BUT IT LATER MADE A COMEBACK.

Britain’s Governing Council of the Cat Fancy (GCCF) recognized the Russian Blue as a distinct breed in 1912. The cat was often referred to as a "Blue Foreign type” or the "Foreign Blue." But World War II eventually broke out, and many breeders no longer had the resources to continue the kitty's bloodline. The Russian Blue dwindled in number, but after the war ended, cat lovers in countries including Britain, Sweden, Finland, and Denmark saved the cat by crossbreeding it with other feline types.

Today, the Russian Blue's appearance varies around Europe. Scandinavians mated the cat with Siamese cats, resulting in a longer, more angular look. And in Britain, the kitty was crossbred with bluepoint Siamese cats and British Blues, so they developed a stockier silhouette.

Russian Blues first arrived in America sometime in the 1900s, but it wasn't until much later that the country's cat enthusiasts started breeding them in earnest. They imported Russian Blues from Scandinavia and England, and over time, combined their unique features into the blue-furred, green-eyed cat we know and love today.

4. A RUSSIAN BLUE INSPIRED NYAN CAT.

A Russian Blue cat helped inspire the Internet’s most famous 8-bit animated feline. Nyan Cat—the YouTube video-turned-viral Internet-meme of a flying cat-Pop Tart hybrid flying through space, leaving a rainbow trail in its wake—was created in 2011 by then-25-year-old illustrator Chris Torres, who owned a Russian Blue named Marty.

Torres was participating in a Red Cross donation drive, and received conflicting suggestions on what to draw. One person wanted him to sketch a cat; another, a Pop Tart. Torres ended up drawing a hybrid of both, but if you look closely, you'll notice that the feline portion of Nyan Cat strongly resembles Torres's beloved cat.

This wasn't a coincidence: Marty, who was named after Marty McFly from Back to the Future, “heavily influenced a lot of my comics and the creation of Nyan Cat,” Torres tweeted after his cat died in 2012.

5. THE RUSSIAN BLUE ISN'T TOTALLY HYPOALLERGENIC.

Some people say that the Russian Blue is a good pet for people with allergies. It doesn’t shed a lot, plus the gray kitty allegedly produces lower levels of Fel d 1 protein, the allergenic protein in cat saliva and skin secretions that makes your skin itch and eyes water. But even small amounts of Fel d 1 can cause you to suffer an allergic reaction, plus Russian Blues still have dander. There are plenty of reasons to want the gray cat; just keep in mind that it won't be the solution to your allergy woes.

6. THE RUSSIAN BLUE IS DIFFERENT FROM OTHER "BLUE" CATS.

With its slate-colored fur, the Russian Blue resembles other “blue” short-haired cats like the Chartreux and the British Blue. But if you look closely, you’ll see subtle differences between the three breeds. For one, the Russian Blue has green eyes, whereas the Chartreux has brilliant orange pupils, and the British Blue’s are gold, copper, or blue-green. Also, the Russian Blue and Chartreux have round faces and stocky (if not slightly chunky) bodies, while the Russian Blue is much more elongated and lithe, with a wedge-shaped head. Finally, the Russian Blue's dense, double-layered coat is silky to the touch. In contrast, the British Blue's plush fur feels slightly crisp, and the Chartreux's is tufted and wooly.

7. THE RUSSIAN BLUE IS A LOVING (BUT SHY) FELINE.

If you're looking for a calm cat with a pleasant disposition, consider the Russian Blue. The kitty is shy around strangers, but affectionate with owners. It enjoys sitting quietly by the side of its favorite humans—but it's also down for a playful game of fetch.

8. THE RUSSIAN BLUE GETS ITS HUE FROM A UNIQUE GENE.

The Russian Blue gets its silvery fur from a diluted version of the gene that's responsible for black hairs. If you mate two Russian Blues together, they'll produce a litter of all-gray kittens. But if the Russian Blue is bred with another cat type, the black Russian Shorthair, the union will result in a mix of blue and black kittens. (Mate the Russian Blue with a white feline, and their children will be white, blue, and black.)

All photos courtesy of iStock.