During the 1866 Austro-Prussian War, Saxony sided with Austria, and the Royal Saxon Army was generally seen as the only ally to bring substantial aid to the Austrian cause, having abandoned the defence of Saxony itself to join up with the Austrian army in Bohemia. This effectiveness probably allowed Saxony to escape the   fate of other north German states allied with Austria – notably the Kingdom of Hanover – which were annexed by Prussia after the war. The Austrians and French insisted as a point of honour that Saxony must be spared, and the Prussians acquiesced. Saxony nevertheless joined the Prussian-led North German Confederation the next year. With Prussia's victory over France in the Franco-Prussian War of 1871, the members of the confederation were organised by Otto von Bismarck into the German Empire, with Wilhelm I as its emperor. John, as Saxony's incumbent king, had to accept the Emperor as primus inter pares, although he, like the other German princes, retained some of the prerogatives of a sovereign ruler, including the ability to enter into diplomatic relations with other states. King John was followed by his son King Albert (1873–1902); Albert was succeeded by his brother George (1902–04); the son of George is King Frederick Augustus III. Prince Maximilian (born