What is the font used in Europa Universalis 4?
The Clausewitz engine (the screen shot is of one of the games using it, Europa Universalis III) has fonts as bitmaps saved in the gfx\fonts\ sub-folder of the game's installation folder. For mods, it's in the same folder of the mod's sub-folder.
I ran the font through Identifont and I this font is, IMVHO, Adobe Garamond. The match, especially with the number forms like 4 and 9, is basically perfect.