When the Parliament of 1621 convened, it had been seven years since the dissolution of the so-called ‘Addled Parliament’ of 1614, which had foundered on a fundamental disagreement between King James I and the House of Commons about the legality of impositions. The Parliament of 1621 faced more than unresolved domestic issues; it met under the shadow of the gravest international crisis of the early modern era. The defenestration of Prague in 1618 had marked the beginning of the Bohemian rebellion and the Thirty Years' War, and in the following summer James's son-in-law, Elector Palatine Friedrich V, accepted the Bohemian crown from the rebels, who had just deposed their Habsburg monarch, Ferdinand of Styria. Two days later Ferdinand was elected Holy Roman Emperor, and he was determined to retake the Bohemian dirone from the new Palatine occupant. In the autumn of 1620, the emperor's Spanish cousins aided his cause by dispatching a large portion of the Spanish Army of the Netherlands to invade the Lower Palatinate, Friedrich's rich patrimonial estates on the Rhine.