In 1515 he got into an argument with the Swedish regent Sten Sture the Younger, who spread the rumour that he was allied with the King Christian II of Denmark.

True or not, it resulted in Trolle being removed from his office and put under siege in the archbishop's mansion Almarestäket at lake Mälaren.

This, and subsequent events, supports the notion of the two having made a deal[citation needed] previous to Christian's conquest of Sweden.

The details and death toll are uncertain, for Christian himself wanted the public execution to have as strong effect as possible, and later, King Gustav I of Sweden is likely to have boosted the figures to support his Danish War.

He renounced his Lutheran faith so that he could gain the support of the Catholic Church, and his brother-in-law Holy Roman Emperor Charles V. He gathered an army and sailed to conquer Norway in AD 1530, aiming to re-establish the Union of Kalmar.