Yadiastun sering pisan pinaka pahan sané  kuat saking kastil miwah genah pasayuban sané  kaping untat yéning utsahané sampun kasor, benteng punika nénten kadadosang puyung yéning wénten serangan, sakéwanten kanggén pinaka genah mararyan sang adi kuasa sané  madué  kastil utawi tamiu taler sane ngwakilin.
Although often the strongest part of a castle and a last place of refuge if the outer defences fell, the keep was not left empty in case of attack but was used as a residence by the lord who owned the castle, or his guests or representatives.