The Collaborative International Dictionary of English v.0.48:

Bolden \Bold"en\, v. t. [imp. & p. p. Boldened. ]
   To make bold; to encourage; to embolden.
   [1913 Webster]

         Ready speakers, being boldened with their present
         abilities to say more, . . . use less help of diligence
         and study.                               --Ascham.
   [1913 Webster]