There has 8 Font type for Rome 2. The game use Uppercase and Normal Font both, you can see this on the pictures.
You can use any normal and uppercase font with each other or alone too. This font works in everywhere, so in the battle map too.
Black Chancery Normal and Immortal Uppercase
Canterbury Normal and Possum Saltare Uppercase
Lobster Normal and Segoe Uppercase
Segoe Normal and WetPaint Uppercase