Real union
Real union is a union of two or more states, which share some state institutions in contrast to personal unions; however, they are not as unified as states in a political union. It is a development from personal union and has historically been limited to monarchies. Unlike personal unions, real unions almost exclusively led to a reduction of sovereignty for the politically weaker constituent. That was the case with Lithuania and Norway, which came under the influence of stronger neighbors, Poland and Denmark respectively, with whom each of them had shared a personal union previously. Sometimes, however, a  real union came about after a period of political union. The most notable example of such a move is the Kingdom of Hungary (Lands of the Crown of Saint Stephen), which achieved equal status to Austria (which exercised control over the "Cisleithanian" crown lands) in Austria-Hungary following the Austro-Hungarian Compromise of 1867. Finland under Russian rule. As a result, the eventual subjugation of the Finnish Diet to Russian governmental organs in between 1899 and 1905 and again from 1908 was viewed as unconstitutional in Finland, as was the 1910 codification of Finland's position as an indivisible part  of the Russian Empire governed according to a "set of special laws". After the February Revolution in March 1917, the Russian Provisional Government repealed all of the restrictions imposed on Finnish autonomy from February 1899.