Diet of Speyer of 1529

The Diet of Speyer or the Diet of Spires (sometimes referred to as Speyer II) was a Diet of the Holy Roman Empire held in 1529 in the Imperial City of Speyer (located in present-day Germany). The Diet condemned the results of the Diet of Speyer of 1526 and prohibited future reformation. It resulted in the Protestation at Speyer.

The Diet of Speyer was convened in March 1529, for action against the Turks, whose armies were pressing forward in Hungary, and would besiege Vienna later in the year, and against the further progress of Protestantism.

The Diet opened on 15 March. The Catholic dignitaries appeared in full force, as did various princes and representatives of imperial cities who were leaning towards Luther and Zwingli's reforms. Ascendant Roman Catholic forces, particularly given Charles V's recent successes against the French in Italy, aimed to reverse the policy of religious tolerance adopted in 1526.

The meeting was not attended by Charles. He sent instructions to his regent, Ferdinand, to pursue a conciliatory line, but his advice did not reach his brother in time. Instead, Ferdinand read out his own far less conciliatory suggestions in Charles's name at the start of the Diet. Ferdinand condemned the way many princes had interpreted the recess issued at Speyer in 1526. He specifically denied them the right to choose which religious reforms would take effect in their states, and ordered that Catholicism be followed in all states of the Holy Roman Empire.

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