In Norway there was a deaf person, Andreas Christian Møller, who established the first school for the deaf back in 1825.
At this school, sign language was the language of instruction.
Click on the picture for a video (Norwegian Sign Language) , of the story of Norway's first deaf deaf school teacher Andreas Christian Møller. The film was made by students at A.C. Møller school and was shown in connection with the school's 190th anniversary and at the Culture Meeting in Holmestrand.
Former School for the Deaf in Trondheim (NO), now the Norwegian Museum of Deaf History and Culture.Source: https://norsk-dovemuseum.no/doveskoler-i-norden