Muroma
The Muromians (Slavic: Мурома) lived in the Oka River basin. They are mentioned in the Primary Chronicle. The old town of Murom still bears their name. The Muromians paid tribute to the Rus' princes and, like the neighbouring Merya tribe, were assimilated by the East Slavs in the 11th to 12th century as their territory was incorporated into the Kievan Rus'.
The Muromian language is unattested, but is assumed to have been Uralic, and has frequently been placed in the Volga-Finnic category. A. K. Matveyev identified the toponymic area upon Lower Oka and Lower Klyazma, which corresponds with Muroma. According to the toponymy, the Muroma language was close to the Merya language.
Read more about this topic: Volga Finns