In 1630, Pope Urban VIII decreed their title to be Eminence (previously, it had been "illustrissimo" and "reverendissimo")  and decreed that their secular rank would equate to Prince, making them secondary only to the Pope and crowned monarchs.
In was year was the title decreed Eminence? Who decreed this? What rank did the Eminece decree assigned? Who held more power then the cardinal? Which pope decided that being pope was equal to being a prince?