It was established by the end of the 19th century that the majority of the population of central and Southern Macedonia (vilaets of Monastiri and Thessaloniki) were predominantly an ethnic Greek population, while the Northern parts of the region (vilaet of Skopje) were predominantly Slavic. Jews and Ottoman communities were scattered all over. Because of Macedonia's such polyethnic nature, the arguments which Greece used to promote its claim to the whole region were usually of historical and religious character. The Greeks consistently linked nationality to the allegiance to the Patriarchate of Constantinople. "Bulgarophone", "Albanophone" and "Vlachophone" Greeks were coined to describe the population who were Slavic, Albanian or Vlach (Aromanian)-speaking. There was also pressure on Aromanians to become linguistically dissimilated from the 18th century, when dissimilation efforts were encouraged by the Greek missionary Cosmas of Aetolia (1714–1779) who taught that Aromanians should speak Greek because as he said "it's the language of our Church" and established over 100 Greek schools in northern and western Greece. The offensive of the clergy against the use of Aromanian was by no means limited to religious issues but was a tool devised in order to convince the non-Greek speakers to abandon what they regarded as a "worthless" idiom and adopt the superior Greek speech: "There we are Metsovian brothers, together with those who are fooling themselves with this sordid and vile Aromanian language... forgive me for calling it a language", "repulsive speech with a disgusting diction".