in Nitra was built the oldest (known) church in the middle Europe and in Slavic countries at the same time, consecrated in 830 AD by Salzburg bishop Adalram.

Actually http://en.wikipedia.org/wiki/Church_of_Saint_Apostles_Peter_and_Paul_%28Novi_Pazar%29 8)

I ask you, dear Dervan, because we are discussing, not? :D

Well, I'm not expert about this, I can only read other historians opinions, and see what's more logic.