Lewis & Short

Complūtum, i. n., a town of the Carpetani in Hispania Tarraconensis, now Alcala de Henarez, Prud. στεφ. 4, 43.
Hence, adj.: Complūtensis, e, of or belonging to Complutum, Complutensian: ager, Paul. Nol. Carm. 32, 605.
As subst.: Complūtenses, ium, m., the people of Complutum, Plin. 3, 3, 4, § 24.