Mamsell (from the French Mademoiselle) was a historical Swedish honorific used for unmarried middle class women from about the mid 18th-century until 1866.
[1][2] Previously, the title fru had also been reserved for noblewomen, but it began to also be used for people outside the nobility much earlier than fröken.
The reform was mentioned in the 1866–1867 New Year's show at the Royal Dramatic Theatre in Stockholm in the satirical song (which rhymes in Swedish):[4] Bort med mamseller, de gamla spöken!
Nu varje flicka får heta fröken, om hon ej föredrar att bli fru år 1867.
Now every girl can be a Miss, Unless she prefers to be a Mrs In 1867 At the Royal Dramatic Theatre, however, the reform was not introduced until after director Edholm was replaced in 1881.