Charles IX of Sweden was a king who ruled from 1604 until his death in 1611. He was born on November 4, 1550, and was the son of King Charles IX of Sweden and Catherine of Sweden. His reign was marked by efforts to strengthen the Swedish monarchy and expand its territories, particularly through military campaigns. During his rule, Charles IX faced challenges from both internal factions and external threats, including conflicts with Denmark and Russia. He is also known for promoting the Protestant faith in Sweden and supporting the development of the Swedish state. His legacy includes the establishment of a more centralized government.