commandery

Short definition from Wiktionary

Noun

1. 1
   A territory under the control of a commander: The smallest division of a manor under the control of a commander of an order of knights, originally only the Knights Hospitaller.
2. 2
   A territory under the control of a commander: Any of various administrative divisions of imperial China.
3. 3
   A chapter of a secret order, especially the Knights Templar (order affiliated with Freemasonry).