Cosmas of Prague
Świny Castle was first documented in 1108 by the medieval chronicler Cosmas of Prague, author of the "Chronica Boemorum", who mentioned one Voivode Mutina of the Vršovci dynasty meeting his uncle Nemoy at "Castrum Suini in Poloniae" to plot against Duke Svatopluk of Bohemia. "Suini" is thereby the oldest known castle in Lower Silesia. It again appeared as "Zpini" in an 1155 deed issued by Pope Adrian IV.