Lewis & Short

Marcĭus, a, the name of a Roman gens.

    1. 1. Ancus Marcius, the fourth king of Rome, Liv. 1, 32; Cic. Rep. 2, 18, 33; 2, 20, 35.
      L. Marcius, a Roman knight, who commanded the army in Spain after the death of the Scipios, Liv. 25, 37 sq.
    2. 2. Two brothers Marcii, Roman soothsayers in very ancient times, Cic. Div. 1, 40, 84; 1, 50, 115; 2, 55, 113.
      In fem.: Marcĭa, a vestal virgin, Ascon. Cic. Mil. p. 46 Orell.
      Hence,
  1. A. Marcĭus, a, um, adj., of or belonging to a Marcius, Marcian: Marcia aqua, brought into Rome first by king Ancus Marcius, and afterwards by the prætor Q. Marcius Rex, Plin. 31, 3, 24, § 41; called also: Marcius liquor, Prop. 4, 1, 52: umor, id. 4, 22, 24: lympha, Tib. 3, 6, 58; and: frigora, Stat. S. 1, 5, 25: Marcius saltus, in Liguria, where the consul Q. Marcius suffered a defeat, Liv. 39, 20.
  2. B. Marcĭānus, a, um, adj., of or belonging to a Marcius: carmina, of the soothsayer Marcius, Liv. 25, 12: foedus, made by L. Marcius with the inhabitants of Gades, Cic. Balb. 17, 39.
    Silva Marciana, a mountain-range in western Germany, the Schwarzwald, Amm. 21, 8, 2.
    Hence, adv.: Marcĭānē, in the manner of Marcius, Prisc. vol. 2, p. 528, 25 Hertz.