 After lengthy negotiations, Bern was able to secure control of the County of Lenzburg as subtenants in 1433 and finally in 1442 of the castle.The first Bernese Landvogt took up residence in the castle in 1444, governing the district of Lenzburg from there.The duties of a Landvogt included collecting taxes, implementing administrative measures, judicial and police tasks and the power of military decree; they were also responsible for the upkeep of the castle.