Lewis & Short

2. Pergămum, i, n., a city in Mysia, on the Caystrus, the residence of the Attalian kings, with a celebrated library, now Bergamo, Plin. 5, 30, 33, § 126; Liv. 29, 11; 37, 19; 20 al.
Hence,

  1. A. Pergămēnus, a, um, adj., = Περγαμηνός, of or belonging to Pergamum in Mysia, Pergamean: Pergamena civitas, Cic. Fl. 30, 64: ager, Liv. 37, 21: naves, Nep. Hann. 11, 5.
    Pergamena charta, or as subst.: Pergămēna (collat. form Pergămīna, Not. Tir. p. 124), ae, f., parchment, a material for writing on, prepared from the skins of animals, invented by Eumenes, king of Pergamum, Isid. Orig. 6, 11; Hier. Ep. 7, n. 2; cf. Varr. ap. Plin. 13, 11, 21, § 70.
    Pergămēna, ae, f., the country about Pergamum, Plin. 5, 30, 33, § 126.
    In plur.: Pergămēni, ōrum, m., the inhabitants of Pergamum, the Pergameans, Cic. Fl. 30, 74.
  2. B. Pergămĕ-us, a, um, adj., of or belonging to the city of Pergamum, Pergamean (poet.): deus, i. e. Æsculapius (who was worshipped at Pergamum), Mart. 9, 17, 2.