 Complete the following phrase:  Knut Alvsonn, of the Swedish Tre Rosor noble family, was the great-grandson of Sigurd Jonsons sister He was a Royal Councillor of Norway, and holder of vast landed properties around Norway, having inherited such from his Giske-Bjarkoy-Sudreim ancestors. Knut Alvsonn was a personal enemy of Lord Henrich Krummedige, Danish royal governor in Norway. That made him somewhat an opponent of the union; and he was an ally of Swedens anti-unionist Regent Sten Sture the Elder. Knut Alvsonn is said to have built a basis to grab the Norwegian throne, starting in the late 15th century. He started an open 