The creation of these new provinces was achieved in order to facilitate the incorporation of the northwestern portion of the Iberian peninsula, inhabited by the Gallaeci, Cantabri, and Astures, into the Roman empire.
He also regularised the status of the other political entities in the province, the civitates stipendiaria (communities subject to tribute), whose affairs could be directly intervened in by the governor.
Between the reigns of Augustus and Nero, imperial interventions led to the regularisation of the old pre-Roman roads and their conversion into Roman roads, which formed a framework for the provincial territory which brought the provincials into contact with Roman culture (Latin rapidly became the common language of the province) and gave them access to highly developed economic networks and a monetary economy.
The province was effectively at peace except for an attempt at rebellion by the Astures under Nero which was easily suppressed by a primus pilus of the Legio VI Victrix.
When Galba received news that Nero had decided to have him killed, he accepted Vindex's offer, justifying the decision, according to Suetonius, by an oracle delivered by a young prophet two centuries earlier, which predicted that a new ruler of the world would arise in Clunia.
After receiving the support of the governor of Lusitania, the future emperor Otho, he expanded the military forces of the province,[11] which consisted of the Legio VI Victrix, two cavalry alae, and three infantry cohortes, by recruiting various auxiliaries, at least three cohorts of Vascones, and the Legio VII Galbiana, and then he set out for Rome in order to seize power.
Under Vespasian an edict seems to have been promulgated, perhaps in AD 74, which permitted many of the province's urban communities to become municipia with Latin rights over the course of his reign and that of his successors, Titus and Domitian.
The Imperial province of Hispania Tarraconensis lasted until the invasions of the 5th century, beginning in 409, when Suebi, Vandals and Alans crossed the Pyrenees, and ended with the establishment of a Visigothic kingdom.
The alluvial gold mines at Las Medulas show that Roman engineers worked the deposits on a very large scale using several aqueducts up to 30 miles (48 km) long to tap water in the surrounding mountains.
By running fast water streams on the soft rocks, they were able to extract large quantities of gold by hydraulic mining methods (Ruina montium).
Each year, they chose one of their number to be the flamen and flamenica (they were not required to be married to one another) of the Imperial cult for the whole province, discharging their functions in the provincial forum in Tarraco.
[16] Excepting the communities on the Balearic Islands, Pliny states that:[16] Now, the whole province is divided into 7 conventus: Carthaginiensis, Tarraconensis, Caesaraugustus, Clunienis, Asturus, Lucensis, and Bracarus...
All free men who served as municipal magistrates (duoviri or aediles) in municipia would obtain Roman citizenship, being assigned to the tribe Quirina.
[17] The concession of this right was used by many tributary and subordinate communities in Tarraconensis to transform themselves into municipia, e.g. Nova Augusta (Lara de los Infantes, Burgos), Bergidum Flavium (Torre del Bierzo, El Bierzo, León), Segovia, Duratón (Segovia), and Aqua Flaviae (Chaves, Portugal).
We do not know exactly where they were stationed; it may have been in Baetica and the southeastern part of Tarraconensis to prevent a possible invasion from North Africa, which was controlled by Lucius Clodius Macer.
In any case, both legions and the Legio VI Victrix abandoned Vitellius and declared their support for Vespasian, who quickly sent them to Germania Inferior to suppress the revolt of Gaius Julius Civilis.