Latgalians (, nds, Letti, Lethi, modern ; variant translations also include Latgallians, Lettigalls or Lettigallians) were an ancient Baltic tribe. They likely spoke the

Latvian language Latvian ( ), also known as Lettish, is an Eastern Baltic language belonging to the Baltic branch of the Indo-European language family, spoken in the Baltic region. It is the language of Latvians and the official language of Latvia as well a ...

, which probably became the '' lingua franca'' in present-day Latvia during the

Northern Crusades The Northern Crusades or Baltic Crusades were Christianity and colonialism, Christian colonization and Christianization campaigns undertaken by Catholic Church, Catholic Christian Military order (society), military orders and kingdoms, primarily ...

due to their alliance with the crusaders. Latgalians later assimilated into the neighbouring tribes, forming the core of modern

Latvians Latvians ( lv, latvieši) are a Baltic ethnic group and nation native to Latvia and the immediate geographical region, the Baltics. They are occasionally also referred to as Letts, especially in older bibliography. Latvians share a common La ...

History

The Latgalians were an Eastern Baltic tribe whose origin is little known. In the 5th and 6th centuries, they lived in the eastern part of present-day Vidzeme (west of the Aiviekste River), and later on in nearly all the territory of that region. In written sources, they are mentioned from the 11th century onward. In the first two decades of the 13th century, the (Western) Latgalians allied with German (mainly Saxon) crusaders. Their lands (the Eldership of Tālava, the Principality of Jersika and the Principality of Koknese) were incorporated into

Livonia Livonia ( liv, Līvõmō, et, Liivimaa, fi, Liivinmaa, German and Scandinavian languages: ', archaic German: ''Liefland'', nl, Lijfland, Latvian and lt, Livonija, pl, Inflanty, archaic English: ''Livland'', ''Liwlandia''; russian: Ли ...

as vassal states. In the 11th century,

Eastern orthodoxy Eastern Orthodoxy, also known as Eastern Orthodox Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or " canonica ...

started to sprea