Proper noun
Old Swedish
The medieval form of the Swedish language, markedly different from the modern language in having more complex case and gender systems.
In Old Norwegian, Old Danish and later Old Swedish the groups hl, hr, hn were reduced to plain l, r, n, suggesting that they were most likely realised as voiceless sonorants by Old Norse times. Source: Internet
The text marks the beginning of Old Swedish as a distinct dialect. Source: Internet