Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Origin hypotheses of the Croats
With the development of Croatian historiography, since the 17th century, the Slavic theory was elaborated in more realistic terms, and considered Croats as one of the Slavic groups which settled in their modern-day homeland during the migration period. Constantine the VII's work was particularly researched by the 17th century historian Ivan Lučić, who concluded that the Croats came from White Croatia on the other side of the Carpathian mountains, in "Sarmatia" (Poland), with which historians today agree upon. The autochthonous idea, that the Slavs came to Illyricum from Poland is of even older origin (12th century).