The Lutheran Reformation was especially popular among the German and Slovak population in the northern villages and towns of Hungary in the first half of the 16^th century The congregations were however, not organised according to their linguistic differences, but according to administrative communities (towns, villages). Thus there were formed bi- or even tri-lingual (Hungarian-Slovak-German) congregations. Such mixed communities are still existing in spite of the fact that, after World War II, a great many Germans emigrated and minor exchanges of the populations also took place between Hungary and Slovakia. The members of the bi-lingual congregations live in good fraternal agreement.