In the mirror universe, Caitians could be found in attendance at Starfleet Academy by the 2270s. Their presence on Earth and within Imperial Starfleet was an indication that Caitians had, at some point, come under the dominion of the Terran Empire. (TOS novel: The Sorrows of Empire)

It is not known whether the mirror Caitians were either conquered by the empire, or had willingly joined as had Coridan.
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