Not gonna lie, your post intrigued me. I downloaded the game to give it a try for the first time in a *LONG* time.
Running perfectly well on a machine with these stats (clearly this is if you are worried about too new of a machine not working, lol):
AMD Ryzen 7 1800X
Windows 8.1 x64
Running at 1920x1200 on one monitor of a multi-monitor setup (both 1920x1200)
Forgot a LOT about this game. LOL, bandits killed my opening city almost immediately, forgetting that they come with no base defense/garrison at all. Good thing you can just re-found your kingdom with your sovereign in this case! Think I may play with this for a couple more days!