West Slavic languages
The Rani spoke a Polabian tongue, which belonged to the Lechitic group of the West Slavic languages. In the course of the 12th to 15th centuries, it was replaced by Low German as politics and ethnic structure had changed due to the Ostsiedlung. The Rani language became extinct when the last Rujani-speaking woman died on the Jasmund peninsula in 1404.