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
Since 1998, the official status of the Latvian language has been written into the Constitution (Article 4); and since 2002, MPs have been asked to promise to strengthen Latvian as the only official language in order to take their seats (Article 18). In the Constitution's chapter on human rights, rights to get answers from authorities in Latvian are specified since 2002 (Article 104). The current Official Language Law Law was not amended since its adoption in 1999 (as at 2017).