Lewis & Short

Mancīnus, i, m.,

  1. I. a Roman proper name, e. g. C. Hostilius Mancinus, a consul who was delivered up to the Numantines, on the refusal of the Roman people to ratify the dishonorable treaty of peace which he had made with them, Cic. Rep. 3, 18, 28; id. de Or. 1, 40, 181; 1, 56, 238; 2, 32, 137; id. Off. 3, 30, 109; id. Caecin. 34, 98; Paul. ex Fest. p. 131 Müll.
    Hence,
  2. II. Mancī-nĭānus, a, um, adj., of or belonging to Mancinus: deditio, i. e. the delivering up of Mancinus, Flor. 3, 14, 2.