When was the Emperor of Austria and King of Hungary died who proclaimed December Constitution?
December Constitution: The December Constitution (German: "Dezemberverfassung") is a set of six acts that served as the constitution of the Cisleithanian half of Austria-Hungary. December Constitution:  The acts were proclaimed by Emperor Franz Joseph on December 21, 1867 and functioned as the supreme law of the land until the collapse of the empire in 1918.
i don't know