Title: Reuerendissimorum et illustrissimorum S. Rom. Imperij Principum Apologiae pro D.N. Imp. Henrico IV. Franco ..
Subjects: Church and state, History, Investiture
Places: Holy Roman Empire
People: Gregory VII Pope (ca. 1015-1085), Henry IV Holy Roman Emperor (1050-1106)
Time periods: Henry IV, 1056-1106