During this period the language went through several changes: morphological paradigms were simplified, including the loss of grammatical cases and the levelling of personal inflection on verbs.
An epenthetic "e" gradually appeared before the nominative -r ending from Old Norse to ease pronunciation.
During the 15th century, Middle Norwegian gradually ceased to be used as a written language.
At the end of the 16th century, Christian IV of Denmark-Norway (1577–1648) decided to revise and translate Magnus VI of Norway's 13th century Landslov "Country Law" into Danish, since it was originally written in Old West Norse.
The translation of this law marks the final transition to Danish as the administrative language in Norway.