The decision of the Diet of Speyer, August 27, 1526, which allowed every sovereign authority, pending the meeting of a council, to decide matters of faith for itself and its province, recognizing its accountability to God and the emperor, conceded, even though in limited terms, a canonical basis for the application of territorialism in favor of the Reformation.
On August 27, 1526, at the Diet of Speyer, it was decided that each sovereign authority could independently determine matters of faith within their province, recognizing its duty to God and the emperor. This decision, though limited, provided a basis for territorialism in support of the Reformation.