Maria Theresa issued the Declaratory Rescript of the Illyrian Nation on 16 July 1779, responding to Orthodox petitions and replacing earlier regulations.

The Declaratory Rescript of the Illyrian Nation (Latin: Rescriptum Declaratorium Illyricae Nationis) was issued on 16 July 1779 by Maria Theresa, Dowager-Empress and Queen of Hungary. It was a royal rescript answering a series of petitions from Eastern Orthodox subjects of the Habsburg monarchy concerning their religious freedom and ecclesiastical autonomy. The document concluded a process begun with the Regulamentum privilegiorum (1770) and Regulamentum Illyricae Nationis (1777), both of which it replaced.

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