Lewis & Short

Pyrrhus, i, m., = Πύρρος.

  1. I. Son of Achilles and Deïdamia (otherwise called Neoptolemus), founder of a kingdom in Epirus, slain at Delphi by Orestes, Just. 17, 3, 18; Verg. A. 2, 469; 526 sq.; Ov. H. 8, 3; Hyg. Fab. 97; 123; Dict. Cret. 4, 15.
      1. 2. Pyrrhi Castra, a place in Laconia, Liv. 35, 27; in Triphylia, id. 32, 13.
        Hence,
    1. B. Pyrrhĭdae, ārum, m., the inhabitants of the kingdom founded in Epirus by Pyrrhus, Just. 17, 3, 3.
  2. II. King of Epirus, about 280 B.C., an enemy of the Romans; on account of his descent from Achilles, called Aeacides (v. h. v.), Cic. Lael. 8, 28; id. Rep. 3, 28, 31; id. Fin. 2, 19, 61; id. Off. 1, 12, 38; 3, 22, 86; Hor. C. 3, 6, 35; Just. 35, 3 sqq.; Sil. 14, 94.