The Collaborative International Dictionary of English v.0.48:

Legatine \Leg"a*tine\ (-[.a]*t[imac]n), a.
   1. Of or pertaining to a legate; as, legatine power.
      --Holinshed.
      [1913 Webster]

   2. Made by, proceeding from, or under the sanction of, a
      legate; as, a legatine constitution. --Ayliffe.
      [1913 Webster]