The Krak and Princess Wanda legend appeared in the early Polish history written by Wincenty Kadlubek; a similar legend, that of Krok and Libussa, appeared in the early Czech history by Cosmas of Prague.
Historians who made use of Regino's chronicle include Cosmas of Prague.
According to Cosmas' chronicle, Slavník was a happy man all his lifetime.
According to Cosmas’s chronicle, Saint Adalbert of Prague in 994 offered his episcopal see to Strachkvas, explaining that Strachkvas came from the Přemyslids, and it would be easy for him to bend people to his will; but Strachkvas refused the episcopacy.
Świny Castle was first mentioned in 1108 as Castrum Suini in Poloniae by the medieval chronicler Cosmas of Prague, it is thereby the oldest castle in Lower Silesia.
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