The Collaborative International Dictionary of English v.0.48:

Manbote \Man"bote`\, n. [AS. man man, vassal + b[=o]t
   recompense.] (Anglo-Saxon Law)
   A sum paid to a lord as a pecuniary compensation for killing
   his man (that is, his vassal, servant, or tenant). --Spelman.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

MANBOTE. In a barbarous age, when impunity could be purchased with money,
the compensation which was paid for homicide was called manbote.