 He was declared king as Karl IX (anglicized as Charles IX).Charles's short reign was one of uninterrupted warfare.The hostility of Poland and the breakup of Russia involved him in overseas contests for the possession of Livonia and Ingria, the Polish–Swedish War (1600–1611) and the Ingrian War, while his pretensions to claim Lappland brought upon him a war with Denmark in the last year of his reign.