It is one of the three Eufemiavisorna, Swedish translations of originally French romances composed at the behest of Queen Euphemia of Rügen (1270–1312).
[1] The poem's main character is Duke Frederick, a knight of the court of King Arthur.
In return, Malmrit gives Frederick a magic ring with the power of making its bearer invisible.
Frederick uses it to gain access to a tower where the King of Ireland has imprisoned his beautiful daughter Floria.
Frederick begins a sexual relationship with Floria and eventually, through a series of adventures, brings her and a great fortune with him back to Normandy.