プロテスタント同盟
On 21 January 1621, Ferdinand issued a decree against Frederick and Anhalt, accusing them of breach of peace, supporting rebels, and treason. Ferdinand decreed that Frederick's lands and titles within the Holy Roman Empire were now forfeited. On 6 February 1621, representatives of the Protestant Union met with Ferdinand at Heilbronn to protest, but they soon agreed to support the settlement in the Palatinate, and the Palatinate remained occupied by Spanish troops. At this point, the Protestant Union had essentially ceased to exist.