At the same time, it became clear that the castle was becoming too small to hold the functions necessary in order to function as a royal residence and seat of the administration so a series of smaller buildings began to be erected on Slotsholmen. Probably during the reign of Christian III a building was constructed on the quay of the canal in front of the castle to house the Chancellery. During the reign of Christian III and Frederick II an arsenal was constructed by the beach south of the castle, and during the reign of Frederick II probably also a supply depot.