The Collaborative International Dictionary of English v.0.48:

Palsgrave \Pals"grave`\, n. [D. paltsgraaf; palts palace (l.
   palatium) + graaf count; cf. G. pfalzgraf. See Palace, and
   Landgrave.] (Ger. Hist.)
   A count or earl who presided in the domestic court, and had
   the superintendence, of a royal household in Germany.
   [1913 Webster]

WordNet (r) 3.0 (2006):

palsgrave
    n 1: (Middle Ages) the lord of a palatinate who exercised
         sovereign powers over his lands [syn: palatine,
         palsgrave]