What is "burggrave"

Burggrave \Burg"grave\, n. [G. burggraf; burg fortress + graf count: cf. D. burggraaf, F. burgrave. See Margrave.] (Germany) Originally, one appointed to the command of a burg (fortress or castle); but the title afterward became hereditary, with a domain attached.

n. 1 (lb en historical Germany) One appointed to the command of a burg (gloss: fortress or castle). 2 (lb en Germany) One who holds a hereditary title, with an associated domain, descended from an ancestor who commanded a burg.