[a] Her marriage by proxy with Przemysł II, Duke of Greater Poland, took place in the Swedish city of Nyköping on 11 October 1285.
In the same ceremony, Richeza's younger sister Marianne (or Marina), was married to a German nobleman, Count Rudolph II of Diepholz.
[2] Richeza's marriage, concluded through the mediation of the House of Ascania, rulers of Brandenburg, was performed without the consent of her father, ex-King Valdemar.
Their only child was born on 1 September 1288 in the city of Poznań: a daughter, named Richeza, who later became in Queen consort of Bohemia and Poland as a wife of Wenceslaus II and after his death, of Rudolph III of Habsburg.
[6] The deep and strong feelings of Przemysł II for Richeza are evidenced in two facts: firstly, he named their daughter after her, and secondly, he mentioned her in a document issued on 19 April 1293 where Przemysł II ceded to the Bishopric of Poznań the village of Kobylniki as payment for a lamp lit eternally at Richeza's tomb, and also expressed his desire to be buried next to her.