Lewis & Short

Jūlĭō̆brĭga, ae, f., a town in Hispania Tarraconensis, Plin. 3, 3, 4, § 27.
Hence, Jūlĭō̆brĭgensis, is, m., an inhabitant of Juliobriga, Plin. 4, 20, 34, § 110.