On 18 October 1702, Hedvig Sofia became a
widow and formal
Regent for her minor son, the Duke of Holstein-Gottorp. However, she spent most of her time in Sweden and rarely visited the home of her spouse: she left the daily affairs of the duchy to
Christian August of Holstein-Gottorp, the uncle of her late spouse, but matters of major importance were always to be confirmed by her. She did have plans to visit Holstein-Gottorp in 1705, but her brother asked her to remain in Sweden, which she consented to do. This led to some strain relation with the administration in Holstein-Gottorp, who was considering a different alliance, but she kept in control of the policy and her line was kept until her death without it leading to any open conflict. In Sweden, she worked to have her son accepted as an heir to the Swedish throne, and the "
Holstein Party", as it was to be called after the death of her brother, was also the most successful contestant under her leadership until her death in 1708. As a widow, she was the object of plans to arrange a new political marriage. Among the candidates were the Crown Prince of Hanover, that is the future King
George II of Great Britain. She was the center of the social life at court, and it was said that all pleasure of court life ended after her death. She was an accomplished singer: during the Great Northern war, she appeared as a singer at concerts at court, while her sister, Ulrika Eleonora, played the clavier. Like her sister, she repeatedly asked her brother for permission to visit him on the battle field during the war, which was common for many other women to do, but he refused them every time. In 1708 she died of smallpox, which she had contracted by nursing her son through the illness. The relationship between her and her brother, King Carl, was very deep. In July 1709, her brother, who recently had become a refugee of his military catastrophe at
Poltava and was far away in
Bendery (today in
Moldavia) finally received the news of Hedvig Sophia's death in Stockholm the previous December. Carl at first refused to believe it, and this was the only time he was ever known to have wept. It was "an event which I had trusted never to be so unhappy to survive" and he suffered from "that grief which can never altogether leave me until those who have been parted shall meet again". Hedvig Sophia's proper funeral and interment in
Riddarholm Church did not take place until 1718, after the death of Carl. She was temporarily interred in 1708, but her permanent funeral was delayed awaiting her brother's orders from how it should be conducted. In 1716, however, she was hastily buried along with her grandmother without him being asked, as they were worried that he would insist on a funeral of a kind which the country could no longer afford. She is perhaps most well known for the extensive correspondence between her and her brother King Carl XII, who spent much of his life on war campaigns abroad. When he died in 1718 and left no heirs to the throne, the late Hedvig Sophia's only child, Duke
Karl Friedrich was in line to succeed him, but the late king's younger sister
Ulrica Eleonora quickly moved herself onto the throne instead. Hedvig Sophia was the paternal grandmother of
Emperor Peter III of Russia. ==Issue==