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.
Latvia
As of March 2011, Latvians form about 62.1% of the population, while 26.9% are Russians, Belarusians 3.3%, Ukrainians 2.2%, Poles 2.2%, Lithuanians 1.2%, Jews 0.3%, Romani people 0.3%, Germans 0.1%, Estonians 0.1% and others 1.3%. 250 people identify as Livonians (Baltic Finnic people native to Latvia). There were 290,660 non-citizens living in Latvia or 14.1% of Latvian residents, mainly ethnic Russians who arrived after the occupation of 1940 and their descendants.