The obligation applied also where there was no citizen castellan at thé castle, ór if he was frequently absent. Usually the responsibilities of a casteIlan consisted of military services obligation for the castle's garrison, keeping defences and protecting the castle't lands, mixed with the lawful administration of regional gets and workers including the castle'h domestic personnel. 5This changed as kings increased in energy and as thé Holy Roman Empérors replaced recalcitrant vassals with rival ministerial appointments. 4In the ninth millennium, as fortifications improved and nobleman had difficulty producing their subordinates spend their taxes or deliver the armed service help they demanded, castellans increased in strength, holding their fiefdoms without much issue for their overlord's demands. To overcome this, they appointed castellans as their respected vassals to manage a castle in exchange for obligations to the landlord, usually a commendable. The problem place in exerting handle and specialist in each area when a chief could just end up being in one location at a time. Some armed service leaders gained handle of many locations, each with á castle.

The answer to recurrent invasion had been to make fortified places which progressed into castles. Aftér the drop of the West Roman Empire, foreign tribes moved into traditional western Europe, causing turmoil.

Fisicoquimica de castellan