1. The governor or commander of a castle or fortified town.
Usage: historical; often used in medieval European contexts

Examples

• The castellan of the fortress defended it against the invading army.
• During the Middle Ages, a castellan held significant power over the surrounding lands.
• The king appointed a trusted castellan to oversee the castle's defenses.
• As castellan, she was responsible for maintaining the castle's supplies and garrison.
• The old castellan had served the castle for over thirty years before retiring.