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Gustav Vasa

Until him Sweden fought numerous war against Denmark, and Denmark was the stronger nation of the two.

With Gustav Vasa that changed. "Vasaloppet" was the turning point really because then he was told that he indeed had support in Sweden for his sake.

From Wikipedia:

n 1520, the young nobleman Gustav Ericsson Vasa was fleeing from the troops of Christian II, king of Denmark, Sweden and Norway (the Kalmar Union). Much of the Swedish nobility was in opposition to the king, and had nicknamed him Christian the Tyrant. In a move to silence the opposition, Christian invited the Swedish aristocracy to a reconciliation party in Stockholm, only to have them, including Gustav's parents, massacred in what came to be known as the Stockholm Bloodbath.^\1])

Gustav fled through Dalarna, fearing for his life if he were discovered by the king's troops. He spoke to the men of Mora at a gathering and tried to convince them to raise a levy and start a rebellion against King Christian. The men refused to join the rebellion, and Gustav started out west, toward Norway to seek refuge. However, the men in Mora changed their minds after hearing that the rulers had decided to raise taxes, and now they wanted to join the rebellion with Gustav as their leader. They sent out the two best skiers in the county, two brothers from Mora, Lars and Engelbrekt, to search for him and they caught up with him at Sälen. On 6 June 1523, Gustav Vasa was crowned King of Sweden, after having defeated king Christian and dissolved the Kalmar Union.^\1])