Which 1629 imperial edict ordered the return of secularized church lands?

The 1629 imperial edict ordering the return of secularized church lands was the Edict of Restitution.

Holy Roman Emperor Ferdinand II proclaimed the Edict of Restitution on March 6, 1629, after a series of Catholic military victories. It sought to enforce the “Ecclesiastical Reservation” of the 1555 Peace of Augsburg, which had restricted the conversion and secularization of Catholic church territories after the Reformation.

In practice, the edict demanded that Protestant rulers return large amounts of land taken from Catholic bishoprics, monasteries, and other ecclesiastical institutions. Its implementation threatened the political power and wealth of many Protestant princes, making it both a religious and constitutional crisis inside the Empire.

The policy initially strengthened the Emperor’s position but proved difficult to enforce. Resistance from Protestant rulers, military pressures, and concern among some Catholic allies eventually led Ferdinand to moderate the edict in the Peace of Prague in 1635. The Edict of Restitution is therefore remembered as a major turning point in the Thirty Years’ War, not merely as a church-property regulation.

The Peace of Augsburg was the earlier settlement whose rules the edict tried to enforce; it was not the edict itself.