The Bock (Luxembourgish: Bockfiels) is a promontory in the north-eastern corner of Luxembourg City's old historical district. Offering a natural fortification, its rocky cliffs tower above the River Alzette which surrounds it on three sides. It was here that Count Siegfried built his Castle of Lucilinburhuc in 963, providing a basis for the development of the town which became Luxembourg. Over the centuries, the Bock and the surrounding defences were reinforced, attacked and rebuilt time and time again as the armies of the Burgundians, Habsburgs, Spaniards, Prussians and French vied for victory over one of Europe's most strategic strongholds, the Fortress of Luxembourg. Warring did not stop until the Treaty of London was signed in 1867, calling for the demolition of the fortifications. Rui