I really enjoy the diplomacy, marriage, and plot options in Crusader Kings 2. I'm after options and ideas on ways to expand my realm in this game without war. Examples from games you've played would be awesome if you have them. I find it more fun to scheme sometimes as war can be a bit straight forward (it also wrecks havock in my levies for some time - somehow I always get called to war right after a personal war of expansion).
Oh, it wouldbe helpful to list which DLC you need if applicable.