Imperial Estate in the context of "Diet of Augsburg"

The Czech Republic, also known as Czechia and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the southeast. The Czech Republic has a hilly landscape that covers an area of 78,871 square kilometers (30,452 sq mi) with a mostly temperate continental and oceanic climate. The capital and largest city is Prague; other major cities and urban areas include Brno, Ostrava, Plzeň and Liberec.

The Duchy of Bohemia was founded in the late 9th century under Great Moravia. It was formally recognized as an Imperial Estate of the Holy Roman Empire in 1002 and became a kingdom in 1198. Following the Battle of Mohács in 1526, all of the Lands of the Bohemian Crown were gradually integrated into the Habsburg monarchy. Nearly a hundred years later, the Protestant Bohemian Revolt led to the Thirty Years' War. After the Battle of White Mountain, the Habsburgs consolidated their rule. With the dissolution of the Holy Roman Empire in 1806, the Crown lands became part of the Austrian Empire.

Maximilian II (31 July 1527 – 12 October 1576) was Holy Roman Emperor from 1564 until his death in 1576. A member of the Austrian House of Habsburg, he was crowned King of Bohemia in Prague on 14 May 1562 and elected King of Germany (King of the Romans) on 24 November 1562. On 8 September 1563, he was crowned King of Hungary and Croatia in the Hungarian capital Pressburg (Pozsony in Hungarian; now Bratislava, Slovakia). On 25 July 1564, he succeeded his father Ferdinand I as Holy Roman Emperor.

Maximilian's rule was shaped by the confessionalization process after the 1555 Peace of Augsburg. Though a Habsburg and a Catholic, he approached the Lutheran Imperial estates with a view to overcome the denominational schism, which ultimately failed. He also was faced with the ongoing Ottoman–Habsburg wars and rising conflicts with his Spanish Habsburg cousins.

The German mediatisation (English: /miːdiətaɪˈzeɪʃən/; German: deutsche Mediatisierung) was the major redistribution and reshaping of territorial holdings that took place between 1802 and 1814 in Germany by means of the subsumption and secularisation of a large number of Imperial Estates. Nearly all the ecclesiastical principalities and free imperial cities, as well as most minor secular principalities and other self-ruling entities of the Holy Roman Empire lost their independent status and were absorbed by the remaining states. By the end of the mediatisation process, the number of German states had been reduced from almost 300 to 39.

In the strict sense of the word, mediatisation consists in the subsumption of an immediate (unmittelbar) state into another state, thus becoming mediate (mittelbar), while generally leaving the dispossessed ruler with his private estates and a number of privileges and feudal rights, such as low justice. For convenience, historians use the term mediatisation for the entire restructuring process that took place at the time, whether the mediatised states persisted in some form or lost all individuality. The secularisation of ecclesiastical states took place concurrently with the mediatisation of free imperial cities and other secular states.

The Imperial Diet (German: Reichstag; Latin: Dieta Imperii or Comitium Imperiale) was the deliberative body of the Holy Roman Empire. It was not a legislative body in the contemporary sense; its members envisioned it more like a central forum where it was more important to negotiate than to decide.

Its members were the Imperial Estates, divided into three colleges. The diet as a permanent, regularized institution evolved from the Hoftage (court assemblies) of the Middle Ages. From 1663 until the end of the empire in 1806, it was in permanent session at Regensburg.

The Aulic Council (Latin: Consilium Aulicum; German: Reichshofrat; literally "Court Council of the Empire", sometimes abbreviated in academic writing as "RHR") was one of the two supreme courts of the Holy Roman Empire, the other being the Reichskammergericht (Imperial Chamber Court). Unlike the Reichskammergericht, which was tied to the Imperial estates, the Aulic Council was tied directly to the Emperor.

It had not only concurrent jurisdiction with the Reichskammergericht, but in many cases exclusive jurisdiction: the Aulic Council had exclusive jurisdiction in all "feudal" processes, and in criminal affairs, over the immediate subjects of the Emperor and in affairs which concerned the Empire, and more (see Responsibilities section below). It did not have a single set seat, rather, it was bound with the Emperor's residences. Prague, Wels, and Frankfurt, were all sites of the court, but the most important seat of the Aulic Council was at the Hofburg residence of the Habsburg emperors in Vienna.