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In page Elizabeth Richeza of Poland:

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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[1] and before his coronation as King of Poland on 25 July 1300 in Gniezno, Ryksa was sent to Prague.[citation needed]