In 1448 when Christopher died without close heirs, the union between Sweden and Denmark dissolved, as the two countries chose different kings. Sweden chose Charles Knutsson Bonde, while Denmark chose Christian of Oldenburg (Christian I of Denmark). Norway was thus left with a dilemma. Once again, hereditary rights seem to have had little influence over the decisions made (according to feudal inheritance, the Duke of Mecklenburg would have been closest in rights, and Duke Adolf of Schleswig-Holstein as head of next branch, who however had supported his nephew Christian's election). Sigurd Jonsson, of the Sudreim-line, a descendant of Haakon V of Norway, seems to have been mentioned as a candidate, but turned the offer down. The Norwegian nobility then split between supporters of king Charles of Sweden and King Christian of Denmark. Charles succeeded in being crowned king of Norway in Trondheim in 1449, but in 1450 agreed to renounce the Norwegian throne to King Christian of Denmark in a separate peace deal with Denmark. The Norwegians were not a party to this decision, but were left with Christian as their only candidate. He was crowned in Trondheim the same year. Thus, the House of Oldenburg was first introduced to the Norwegian monarchy. In a union treaty, drawn up by the privy councils of Norway and Denmark in Bergen in 1450, it was specified that Norway was to be an elected kingdom, and have the same king as Denmark in perpetuity. On the death of the king, the Norwegian and Danish privy councils would meet and elect the new king among the previous king's legitimate sons. If no such son existed, the choice was free, but the councils should not part until they had agreed on a common king.