A Landesburg or landesherrliche Burg ("sovereign castle", "state castle" or "stately castle") was a castle that a territorial lord, such as a prince-bishop, duke or prince built for the defence or expansion of his sovereign estates. They were thus the central and most important castles of the great princely territories. The Landesburgen were usually the property of the territorial lord, but they sometimes referred to castles that he did not own, but were available to him as a safe house (Offenhaus). The large castles of the 8th to 10th centuries, east of the Rhine and outside the towns were often described as Landesburgen because they performed important functions in the control of the state. History The emergence of Landesburgen began in the Late Middle Ages and was a result of the decline of royal centralised power and the associated displacement of power "from former great territories to regional territories". In the early stages of this development regional lords used their allodial castles as a means of forming and preserving contiguous territories. In this connexion such fortifications took on the function of a territorial castle (Territorialburg). An example is Zülpich Castle, which was built by the archbishops of Cologne to secure their estates from attack by the counts of Jülich. Often Landesburgen were used as counter-castles (Gegenburgen) to the fortifications of neighbouring and rival territorial lords. Landesburgen were thus a cornerstone of dynastic politics and central to the exercise of political-military power. To achieve the latter, Landesburgen were usually assigned to a permanent cadre of castellans (Burgmannen) and associated troops who thus acted as a garrison. In addition to their importance as an instrument of territorial policy the Landesburgen were given a central role in the administration of the land and the dispensation of justice, typically by being home to a chancery and a treasury. If the sovereign tasked a representative, such as a burgrave or Amtmann, to safeguard regional territorial sovereignty, he would use the castle as a residence and seat of local government. In such cases, it was referred to as an Amtsburg ("administrative castle"), which was the administrative centre of the administrative districts that emerged in the late medieval period. However, if the sovereign prince stayed at the castle - albeit only temporarily - it became known as a Residenzburg or "residence castle". In such a case, it would be enhanced by appropriate representational buildings such as a