I'll Translate
"The Imperial Castle Nuremberg is one of the most important imperial palaces of the Middle Ages. Between 1050 and 1571 it hosted the gatherings of the court, Diets and juridical sessions of all German emperors and kings of the Holy Roman Empire.
A Salian royal castle was built on the rock here as early as the 11th century. In the 12th and 13th centuries Emperor Friedrich I. Barbarossa (1123-1190) and his succesors built one one of the largest and most magnificent castle complexes of the empire on the western rock. The Romanesque double chapel still dates from this time, while the palace and other structures were converted and renewed from 1440 onwards in the Lathe Gothic style. The mighty bastions were first built one century later.
The Imperial Castle was only inhabited during imperial visits. The emperor's permanent administrator lived in the Burgrave's Castle on the eastern rock."