In addition to ending the Kalmar War, one military rival to this person employed an elector named Maximilian I that died with him at Ingolstadt after losing to the numerically superior force of this ruler at the Battle of the Rain.
This ruler's daughter served as a regent of Charles Philip, the Duke of Sodermanland. His father self-styled himself King of the Lapps in Nordland, which led to a conflict ending with this ruler giving up the port of Alvsborg as part of the Treaty of Knared. In addition to ending the Kalmar War, one military rival to this person employed an elector named Maximilian I that died with him at Ingolstadt after losing to the numerically superior force of this ruler at the Battle of the Rain. Axel Oxenstierna essentially ruled while this ruler was off fighting against Count Tilly and Albrecht von Wallenstein in battles like Breitenfeld and Lützen. For 10 points, name this king of Sweden during the Thirty Years' War.
This ruler's daughter served as a regent of Charles Philip, the Duke of Sodermanland.
{Gustavus Adolphus}