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In page Stockholm Bloodbath:

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The Stockholm Bloodbath was a consequence of conflict between Swedish pro-unionists (in favour of the Kalmar Union, then dominated by Denmark) and anti-unionists (supporters of Swedish independence), and also between the anti-unionists and the Danish aristocracy, which in other aspects was opposed to King Christian.[1] The anti-unionist party was headed by Sten Sture the Younger, and the pro-unionist party by the Archbishop Gustavus Trolle.[citation needed]