The Collaborative International Dictionary of English v.0.48:

Galatian \Ga*la"tian\, prop. a.
   Of or pertaining to Galatia or its inhabitants. -- A native
   or inhabitant of Galatia, in Asia Minor; a descendant of the
   Gauls who settled in Asia Minor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Galatian
    n 1: a native or inhabitant of Galatia in Asia Minor (especially
         a member of a people believed to have been Gauls who
         conquered Galatia in the 3rd century BC)