[1][2] The group originates[citation needed] from the Lechitic tribe of Masovians, first referenced in the historical records by Nestor the Chronicler in the 11th century.

[5] Historically, prior to the World War II, the population was known as Masurians (Polish: Mazurzy).

[6] The group originate from the Lechitic tribe of Masovians, first referenced in the historical records by Nestor the Chronicler in the 11th century.

The tribe inhabited an area in modern region of Masovia, centered on the Vistula river.

The main settlements of the tribes were Ciechanów, Czersk, Łomża, Płock, Płońsk, and Wizna.