What is "eufemiavisorna"

The Eufemiavisorna are a group of three medieval romances translated into medieval Swedish: Herr Ivan lejonriddaren (1303), Hertig Fredrik av Normandie (1301 or 1308), and Flores och Blanzeflor (probably 1312). They are known in Swedish (and generally in English) as the Eufemiavisorna, 'the Euphemia poems' (or, without the definite article, the Eufemiavisor) or, less commonly, Eufemiaromanerna, 'the Euphemia romances'; they are known in Norwegian ( bokmål) as the Eufemiavisene. The romances are an early example of the poetic form known as Knittelvers; are the first known Scandinavian renderings of Continental European chivalric romance in verse; and are one of the first major works of literature in Swedish.