When Narek tells a scary campfire story about the end of the world, he mentions that this myth might “date back to long before our ancestors first arrived on Vulcan.” Cue record-stopping sound. WHAT. Did Narek just say that Romulans and Vulcans did not originate on Vulcan? Hold-up. Since when?
Well, as any good Trek fan knows, the Romulans left the planet Vulcan after the time of Surak. Basically, the Romulans didn’t want to be logical and unemotional, and started their own, non-Vulcan Empire. But, if that were true, then shouldn’t Narek have said that the myth “dates back to when Romulans still lived on Vulcan?” Actually, no. In the TOS episode, “Return to Tomorrow,” the alien Sargon (glowing round ball) claims that he and his kind actually seeded the galaxy like a gillion years prior. Kirk dismisses this because it runs counter to evolution, but Spock says that this idea explains certain things about Vulcan prehistory, implying that Vulcans (and by extension, Romulans) might not have originated on the plaent Vulcan.
Later, in TNG episode, “The Chase,” it’s pretty well established that some ancient humanoid race seeded several planets in the Star Trek galaxy. Finally, in the TNG episode, “Who Watches the Watchers,” it’s made very clear that other proto-Vulcans exist on totally unrelated planets, which makes the idea of Vulcans arriving from other planets, totally plausible.
In other words, Narek’s got his history (mostly) correct.
When Narissa fights Seven of Nine in the crashed Borg Cube, she mocks her, saying, “Poor Queen Annika, all she got for her sixth birthday was assimilated.” This references the Star Trek: Voyager episode“The Raven,” in which Seven learns the details of her assimilation.