castellan

noun2

1. •
   (historical) The governor or caretaker entrusted to oversee a castle or keep for its lord.

   • The wave of attacks on the castellans in 1511 followed faction-fighting in Udine, in which castellans and their families were massacred by supporters of the Savorgnan. — 2015
2. •
   (no longer used) A feudal lord with a fortified manor.