Especially in the mountainous regions of Greece were settled Slavs. For example in my village, in the mountains of northern Peloponnese we know that we are of montenegrin/serbian origin. Even my generation still uses plenty of words that I found them in serbian language(krastavac/kastraveci, krava/krava-we use it for women with bad and lazy behaviour-, selo/selo itd). My village’s name is Zemeno which obviously is etymologically related with Zemun in Serbia. But I don’t know if we can identify ourselves as Slavs after sooo many years. Genetically yes, we are Slavs but ethnically I am not so sure that people nowadays would accept that idea.