The princes were divided into two factions due to the previous emperor's incompetence and dogmatism.
The Protestant Union (Protestantische Union) organized against Rudolf II's Catholic oppression.
The Catholic League (Katholische Liga) formed in opposition to it.
The Protestant Union had rebelled against Rudolf II and crowned Matthias, but they wanted too much.
They wanted to restructure the Imperial Diet.
They wanted the right to freely establish Protestant churches and worship in Austria and Hungary.
The price was an oath of allegiance.
Matthias was angered by their attitude of using the oath of allegiance as a bargaining chip, and the Protestant Union prepared its army.
As the crisis of war approached... Matthias stepped back and accepted their conditions.
Yet they demanded even more.
