Castellan

n. governor of a fortress

A castellan was the governor or caretaker of a castle or keep. The word stems from the Latin Castellanus, derived from castellum 'castle'. Usually, a castellan combined the duties of both a majordomo (responsible for a castle's domestic staff) and a military administrator (responsible for maintaining defences and protecting the castle's lands). This was particularly the case if there was no lord resident at the castle, or if the resident lord was frequently absent.
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(n.)
A governor or warden of a castle.
  

Governor or constable of a castle , generally in the lord's absence. 

n.
قلعہ دار , قلعہ کا حاکم