By Lily Rothman
January 19, 2015

Think Downton Abbey and you probably think “British.” The U.K. import is full of British customs, British laws and British actors speaking with British accents. But, in the episode that aired in the U.S. on Jan. 18, a new accent could be heard on the show. When Lady Rose gets involved with helping “her Russians” feel at home in England by inviting them to tea at Downton, she unwittingly reveals a complicated moment from the Dowager’s past — and perhaps also reveals a bit of confusion about Russian history among viewers.

So who are all these “displaced Tsarist aristos,” as Sarah Bunting phrases it? And why are they getting all emotional in the Crawley family’s library?

The reason can be traced back several seasons in Downton-time. Fans may remember that back in Season Two, when Branson’s revolutionary urges were more active, he mentioned in a 1917-set episode that the Tsar had been denounced and was imprisoned by the people, though he was then sorry when the Tsar was killed. The goings-on this season are the result of that history, even though the Crawley family hasn’t discussed it much in the interim.

What happened was that a pair of revolutions in 1917 had removed Tsar Nicholas II and his family from power, and then put the Bolsheviks, led by Lenin, in charge. Here’s how TIME summed the whole thing up in a 1927 profile of Alexander Feodorvich Kerensky, the man who had held power in between the two uprisings:

Lenin was eventually elected president and the Bolshevik (Red) side came to power, driving out their “White Russian” opposition. In 1918, the Tsar and his family were ordered executed, and during the Red Terror of that year, many other counter-revolutionaries and members of the ruling classes were persecuted. (Rumors persisted that the Tsar’s daughter, Anastasia, escaped.) During these years, many members of the Russian elite — whether political leaders or merely wealthy — fled.

Which is how Lady Rose ended up hosting a tea for their fictional counterparts. A family like the Crawleys, firmly rooted in the monarchist tradition of nobility, would be naturally sympathetic to the Russian elites who had been cast out by a new tide of socialism.

That history didn’t stop people like Lady Rose’s Russians from Downton-esque elite disputes: in 1924, the year this episode takes place, a cousin of the late Nicholas II declared himself “Tsar of All the Russias” despite another cousin’s claim to the throne. TIME reported in early 1925 that “a formal feud was opened when the ‘Tsar’ announced, according to buzzing emigre circles in the present capital of Tsarist Russia, Paris, that all those emigres who refused to recognize him as Tsar will be refused admittance by a terrestrial St. Peter when the gates of the Tsarist kingdom are opened.” The threat, however, would never be put to the test: Those real-life Russians and Downton Abbey‘s cast of characters couldn’t have known it then, but the USSR, then newly established, would last for decades. The era of the Tsars was over.

Write to Lily Rothman at lily.rothman@time.com.

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