They originally spoke the Slovincian language, which went extinct in the early 20th century, as well as Kashubian, Polish, and German.

The adoption of Lutheranism in the Duchy of Pomerania in 1534[1][2][3] distinguished the Slovincians from the Kashubes in Pomerelia, who remained Roman Catholic.

[4] In the 16th and 17th century Michael Brüggemann (also known as Pontanus or Michał Mostnik), Simon Krofey (Szimon Krofej) and J.M.

Krofey, pastor in Bytów (Bütow), published a religious song book in 1586, written in Polish but also containing some Kashubian words.

Brüggemann, pastor in Schmolsin, published a Polish translation of some works of Martin Luther and biblical texts, which also contained Kashubian elements.