Johann Zu Schwarzenberg 
Johann Zu was born about 1415. He died due to killed. on May 16th, 1460 in Giengen.General Notes
SOURCES: "Ancestors/Descendants of Royal Lines" (Contributors: Manuel Abranches de Soveral, Reynaud de Paysac, H.R. Moser <Burke Peerage>), O.Guionneau, L.B. de Rouge, E. Polti, A.Terlinden <Genealogy of the existing British Peerage, 1842, and E. Lodge>) http://geneastar.org.
Johann Zu and Kunigunde Von were married in a religious ceremony on February 4th, 1453.