In 1363, former members of the Swedish Council of the Realm, led by Bo Jonsson Grip, arrived at the court in the Duchy of Mecklenburg-Schwerin. The Swedish noblemen promptly persuaded Duke Albert II of Mecklenburg, who had gained influence in the affairs of Sweden by marrying Magnus' sister Euphemia, to intervene against Magnus and Haakon in Sweden and depose them both in favour of his and Euphemia's son Albert. In 1364, Duke Albert enlisted military support from several powerful North German noblemen and proceeded to swiftly invade and conquer Sweden and subsequently installed his son as the new king. In November 1365, the younger Albert was formally hailed as Sweden's new king, though he had already been crowned on 18 February 1364. Magnus sought refuge with his son in Norway where they immediately planned the reconquest of Sweden. After an invasion, a temporary truce was established between the two warring parties, and though Haakon and Magnus had lost control over much of Sweden, they still maintained control over the important provinces of Västergötland, Dalsland and Värmland.