Is the kaiser a rank higher than king conferred by the pope?

No, the title of "Kaiser" is not a rank higher than "King" and it is not conferred by the pope. "Kaiser" is the German Word for "emperor," historically used to denote the ruler of the Holy Roman Empire and later the German Empire. While emperors often held a higher status than kings, the title itself was not directly granted by the pope; rather, it was associated with the idea of imperial authority and sovereignty.