Engagement and marriage with Wenceslaus II
The death of Otto of Brandenburg complicated again Ryksa's situation, because as the only child of the last male member of the Piast Greater Poland line and the first King in almost two centuries, she was the perfect match for every contender to the Polish crown. King Wenceslaus II of Bohemia (a widower since 1297) received from the lords of Greater Poland the offer of marriage with the princess and before his coronation as King of Poland on 25 July 1300 in Gniezno, Ryksa was sent to Prague.
Because of her youth, Wenceslaus II decided to delay the wedding until Ryksa was fifteen years old. He had previously been married to Judith of Habsburg and had four surviving children (Wenceslaus III of Bohemia, Anna of Bohemia, Elisabeth of Bohemia and Margaret of Bohemia). During this time, Ryksa was placed under the care of Gryfina of Halych, widow of Leszek II the Black and aunt of the Bohemian King.
The marriage between Ryksa and Wenceslaus II took place on 26 May 1303 in Prague Cathedral. During the ceremony, Ryksa was crowned Queen consort of Bohemia and Poland, and at the request of her husband, she adopted the name Elisabeth, because her name was not used in Bohemia and seen as strange. The ceremony was performed with the consent of the Archbishops of Mainz and Gniezno and the Bishop of Wrocław, Henryk z Wierzbnej.
Two years later, on 15 June 1305, Queen Elizabeth gave birth to her only known child, a daughter named Agnes of Bohemia. Only six days later, on 21 June 1305, King Wenceslaus II died in Prague, probably of tuberculosis. The seventeen-year-old Elizabeth, now Queen Dowager, received a pension and 20,000 talents of fine silver and the royal towns in East Bohemia of Hradec Králové, Vysoké Mýto, Chrudim, Polička and Jaroměř.