Lewis & Short

purpŭrātus, a, um, adj. [purpura],

  1. I. clad in purple: mulier, Plaut. Most. 1, 3, 131.
  2. II. As subst.: purpŭrātus, i, m., a high officer at a king’s court (so called because clothed in purple), Cic. Tusc. 1, 43, 102; Liv. 30, 42; 37, 23; Flor. 1, 10; Curt. 3, 2, 10; 3, 6, 4.
    Hence, sarcastically of Gabinius, Cic. Cat. 4, 6, 12.