http://3.imgland.net/xcFD4fA.jpg
sorry, the map has a bad quality, i am not so good in making maps.

I mean the purple colored area, ignore the rest of the map.
Would this country be possible ? it should be a country dominated by one ethnic, maybe some small minorities, but it should have one main language. It should not be slavic or germanic though.
So what could it be ? What culture or language would this country have ? How would it be caleld ? it should also be a christian country and be one of the dominating powers of Europe.