Prince Ladislaus of Poland, to Sweden as his successor, under the condition that the boy would be brought up in the Evangelical faith. Otherwise the Estates would look for a new king. In February 1600, Duke Charles summoned the Estates of the Realm to Linköping. Since Sigismund had not provided a reply, the Estates elected Duke Charles as King Charles IX of Sweden. The consequences for those who had supported Sigismund were devastating. The most prominent among them were killed by the new King, in what was called the "Linköping Bloodbath". During the winter and spring of 1600, Charles also occupied the Swedish part of Estonia, as the castle commanders had shown sympathies towards Sigismund. Charles' invasion of Livonia led to a series of wars with Poland, starting with the Second Polish–Swedish War. Charles accepted the crown as Charles IX in 1604. References Notes This article is a translation of the corresponding article from Swedish Wikipedia. See also Cudgel War Polish–Swedish union Polish–Swedish wars Polish–Swedish War (1600–11) Polish–Swedish War (1617–18) Polish–Swedish War (1621–25) Polish–Swedish War (1626–29) Poland–Sweden military relations Wars involving Poland Wars involving Sweden 1598 in Sweden 1599 in Sweden 1598 in the Polish–Lithuanian Commonwealth 1599 in the Polish–Lithuanian Commonwealth 1598 in military history 1599 in military history Swedish Reformation Wars of succession involving the states and peoples of Europe pl:Karol IX Waza#Wojna z Zygmuntem