Tacitus and Pliny are the power couple of the Roman Empire. Like the Angelina Jolie and Brad Pitt of 2000 years ago, except they never split up. The romantic tension between the two is almost unbearable, as I noticed in Pliny's letters.

Here, you can find fanfictions of the two.
 
Please keep in mind their relationship has never been confirmed, (but even marriages ain't gonna stop 'em!) however this does not mean they can't be shipped. *insert some weird pun here*