Historiography
The story of princess Wanda was first described by medieval (12th and 13th centuries) Polish bishop and historian, Wincenty Kadłubek, and it is assumed by most historians that it was invented by him, possibly based on Slavic myths and legends, although some historians see the legend rooted in Scandinavian or Ancient Roman (or Greek) traditions.
Interestingly, the Kadłubek version has the German prince, not princess Wanda, committing suicide: according to Kadłubek, the princess lived a long and happy life, forever remaining a virgin. It was only in the 13–14th century Wielkopolska Chronicle that the variant with Wanda committing suicide was popularized by the 15th century historian, Jan Długosz.
Read more about this topic: Princess Wanda