Duchy of Głogów
In addition to the above, the Silesian Annals tell that a raven carried off the ring which King Matthias, (who was also ruler of the Duchy of Głogów, and Suzerain of all the Silesian duchies), had removed from his finger. Matthias chased the bird down and slew it, retrieving the ring - and in commemoration of this event, he took the Raven as a symbol for his signet sign.