Latgalian language
Originally Latgalians were a tribe living in modern Vidzeme and Latgale. It is thought that they spoke the Latvian language, which later spread through the rest of modern Latvia, absorbing features of the Old Curonian, Semigallian, Selonian and Livonian languages. The Latgale area became politically separated during the Polish–Swedish wars, remaining part of the Polish–Lithuanian Commonwealth as the Inflanty Voivodeship, while the rest of Latvians lived in lands dominated by Baltic German nobility. Both centuries of separate development and the influence of different prestige languages likely contributed to the development of modern Latgalian as distinct from the language spoken in Vidzeme and other parts of Latvia.
Language policy in Latvia
Articles 4 and 114 of the Constitution of Latvia form the foundation for language policy in Latvia, declaring Latvian to be the official state language and affirming the rights of ethnic minorities to preserve and develop their languages. Livonian language is recognized as "the language of the indigenous (autochthon) population" in the Official Language Law, but Latgalian written language is protected as "a historic variant of the Latvian language." All other languages are considered foreign by the law on state languages. Latvia provides national minority education programmes in Russian (the first language for more than one third of the population), Polish, Hebrew, Ukrainian, Estonian, Lithuanian, and Belarussian.