Home › Authors › Transylvania (Principality). Sovereign (1661-1690 : Apafi Mihály I). 👤 Transylvania (Principality). Sovereign (1661-1690 : Apafi Mihály I). Books by Transylvania (Principality). Sovereign (1661-1690 : Apafi Mihály I). No books found yet. Books will appear once the catalogue is populated.