Dublin Castle, the "city in the city" of Dublin in the Middle Ages, King John of England ordered the construction of the Dublin Castle in the early thirteenth century to hold the king's gold and silver jewelry. Gold and silver jewellery is now gone, but the castle is old and strong. The castle has long served as the governor's palace governing Ireland in the United Kingdom. The interior of the elegant St. Patrick's Hall, the Assembly Living Room, and the Throne Hall are decorated with crystals from Watford and Italian marble. Also because of the presence of the English, this place has experienced many times the erosion and baptism of the wave of Irish national liberation. Figure 9 is the most storyful room in Dublin Castle. Irish national hero James Connolly was arrested for leading the 1916 Easter Uprising and was held in the room by the British before the execution of the firing squad. A few months to treat a leg injury. Today, Dublin Castle has become a symbol and witness of Irish national independence and a routine venue for the inauguration of the Irish president.