Is there a game where you can be the ruler of a country?

If you're interested in browser-based games, here are some good games you can have a try:

http://gamelist.bbgsite.com/goto/wartune-_28_r2gam...

Wartune is a Strategy Hybrid MMORPG released by R2games.com & Proficient City Limited. In this exciting strategy/RPG hybrid game, the action begins with the first click! Featuring three unique classes, single and multi-player dungeons, PvP arenas, competitive battle grounds, thousand-player boss battles, a robust guild system, and farming.

http://gamelist.bbgsite.com/goto/forge-of-empires....

Forge of Empires is a browser-based strategy game that lets you create your own city and accompany it from the beginning of the Stone Age onward throughout the centuries. Build structures typical of the epoch. Enlarge your sphere of influence through military campaigns and skillful dealings. With a powerful army and the right tactics, you will subjugate your enemies and forge a vast empire.

http://gamelist.bbgsite.com/goto/1100-ad.shtml

1100AD - new free massive online multiplayer medieval strategy game. Control your land, cause horror on enemies, feel yourself as a mighty king! Construct an ideal medieval settlement over an unoccupied land, matching your wishes. But do not forget the fortifications!

The Ruler Game

I'm not incredibly sure if this is what you mean, but Black and White and Black and White 2 (not Pokemon) are games where you play as a sort of God. In B&W2 you're a Greek god againts the Romans and you try to take over civilizations. You can expand on your own and be good, or be a War God and hold wars against the other small towns/villages.

Check out the Total War series. Not only do you become the ruler of a country trying to take over the known world, you have epic battles against the other countries who are either trying to attack you or defend their lands.

http://youtu.be/P2wmevQx2AI

Therulergame

The tropico series

Try saints row!