The Austro-Hungarian Compromise of 1867 established the dual monarchy of Austria-Hungary, which was a military and diplomatic alliance of the two sovereign states. The Compromise only partially re-established the former pre-1848 sovereignty and status of the Kingdom of Hungary, being separate from, and no longer subject to, the Austrian Empire. The compromise put an end to the 18-year-long military dictatorship and absolutist rule over Hungary which Emperor Franz Joseph had instituted after the Hungarian Revolution of 1848. The territorial integrity of the Kingdom of Hungary was restored. The agreement also restored the old historic constitution of the Kingdom of Hungary.