The Diploma Leopoldinum was a legal document which determined the basic principles of the government of the Principality of Transylvania within the Habsburg Empire.[1][2] The diploma was drafted by Miklós Bethlen, Chancellor of Transylvania.[3][4] The Holy Roman Emperor, Leopold I, sanctioned it in Vienna on 16 October 1690.[5] The diploma announced on 4 December 1691. The diploma restored civil administration in the principality, and confirmed the traditional liberties of the Three Nations of Transylvania, including the freedom of the four "received" religions.[6][7]