The Collaborative International Dictionary of English v.0.48:

Questman \Quest"man\, n.; pl. Questmen.
   One legally empowered to make quest of certain matters, esp.
   of abuses of weights and measures. Specifically:
   (a) A churchwarden's assistant; a sidesman. --Blount. [Obs.]
   (b) A collector of parish rents. --Blount. [Obs.]
       [1913 Webster]