Of course, the Inn Valley was not first colonised with the Roman conquest. The inhabitants of the Alps, described as wild, predatory and barbaric, were labelled by Greek and Roman writers with the rather vague collective term "Raeter". These people probably did not refer to themselves in this way. Today, researchers use the term Raeter to refer to the inhabitants of Tyrol, the lower Engadin and Trentino, the area of the Fritzens-Sanzeno Culturenamed after their major archaeological sites. Two-storey houses with stone foundations grouped in clustered villages, similar language idioms, burnt offering sites such as the Goldbühel in Igls and pottery finds indicate a common cultural background and economic exchange between the ethnic groups and organisations between Vorarlberg, Lake Garda and Istria. According to finds, there was also a lively exchange with other ethnic groups such as the Celts in the west or the Etruscans in the south even before the Roman conquests. Etruscan characters were used for all kinds of records.

According to Roman interpretation, the Breons, a tribe within the Raetians, lived in the area of today's Innsbruck. This name persisted even after the fall of the Roman Empire until the Bavarian colonisation in the 9th century. Although there were no Breon Popular Frontthe quote from Life of Brian could also have been used in pre-Christian Innsbruck:

"Apart from medicine, sanitation, education, wine, public order, irrigation, roads, water treatment and public health insurance, what, I ask you, have the Romans ever done for us?"

A climatic phenomenon known as Roman climate optimum the area north of the Alps for the first time in history. Roman Empire interesting and accessible via the Alpine crossings. From a strategic point of view, the conquest was overdue anyway. The Roman troops in Gaul in the west and Illyria on the Adriatic in the east were to be connected, invasions by barbarian peoples into northern Italian settlements were to be prevented and routes for trade, travellers and the military were to be expanded and secured. The Inn Valley, an important corridor for troop movements, communication and trade on the outer edge of the Roman economic area, had to be brought under Roman control. The transport route between today's Seefeld Saddle and the Brenner Pass already existed before the Roman conquest, but was not a paved, modern road that met the demands of Roman requirements.

In the year 15 BC, the generals Tiberius and Drusus, both stepsons of Emperor Augustus, conquered the area that is now Innsbruck. Drusus marched from Verona to Trento and then along the Adige River over the Brenner Pass to the area that is now Innsbruck. There, the Roman troops fought against the local Breons. The Roman administration was rolled out under Augustus' successor Tiberius. The military was followed by the administration. Today's Tyrol was divided at the river Ziller. The area east of the Ziller became part of the province of Noricum, Innsbruck hingegen wurde ein Teil der Provinz Raetia et Vindielicia. It stretched from today's central Switzerland with the Gotthard massif in the west to the Alpine foothills north of Lake Constance, the Brenner in the south and the Ziller in the east. The Ziller has remained a border in the division of Tyrol in terms of church law to this day. The area east of the Ziller belongs to the diocese of Salzburg, while Tyrol west of the Ziller belongs to the diocese of Innsbruck.

It is unclear whether the Romans destroyed the settlements and places of worship between Zirl and Wattens during their campaign of conquest. The burnt offering site at Goldbühel in Igls was no longer used after the year 15. There are also no precise sources on the treatment of the conquered. The Roman troops most likely drew on the expertise of the local population to secure and construct the transport routes. Today we would probably say that important human resources were handled with caution after the takeover.  

The soon Via Raetia named road made the Via Claudia Augustawhich linked Italy and Bavaria via the Reschen Pass and Fern Pass, as the most important transport route across the Alps. In the 3rd century after the turn of the millennium, the Brenner route became the via publica developed. It was too steep in parts for poorly equipped trade trains to become the main route, but traffic increased noticeably and with it the importance of the Wipp and Inn valleys. Just over five metres wide, it ran from the Brenner Pass to the Ferrariwiese meadow above Wilten over the Isel mountain to today's Gasthaus Haymon. At intervals of 20 to 40 kilometres there were rest stations with accommodation, restaurants and stables. In Sterzing, on the Brenner Pass, in Matrei and Innsbruck, these Roman Mansiones Villages where Roman culture began to establish itself.

The military camp was accessible via this road network Castell Veldidena The Romans were integrated into an economic and intellectual area stretching from Great Britain to the Baltic and North Africa. The Romans brought many of their cultural achievements such as imperial coinage, glass and brick production, the Latin language, bathhouses, thermal baths, schools and wine across the Brenner Pass. Roman law and administration were also introduced. Military service in the Roman army enabled people to climb the social ladder. With an imperial decree in 212, the Breton subjects became full Roman citizens with all the associated rights and duties.

The most important remnant of the Roman Empire after its downfall was the religion and the model of society that was associated with it. After Christianity became the state religion in the 4th century, the Tyrolean region was also missionised. From this time onwards, churches and episcopal administrations existed in Brixen in South Tyrol and in Trento. The saints of Christianity replaced the polytheism. Old festivals such as the winter solstice, harvest customs and the beginning of spring were integrated into the Christian calendar and replaced by Christmas, All Saints' Day and Easter. Legendary figures such as the Saligen Fräulein continued to be worshipped in parallel by devout Christians. The deified Roman emperors were replaced by monarchy and aristocracy. The Christian father of the church, St Paul, in his Letter to the Romans the theological basis for the feudal system that was carried from the church pulpit to the people:

Jedermann sei untertan der Obrigkeit, die Gewalt über ihn hat. Denn es ist keine Obrigkeit außer von Gott; wo aber Obrigkeit ist, ist sie von Gott angeordnet. Darum: Wer sich der Obrigkeit widersetzt, der widerstrebt Gottes Anordnung; die ihr aber widerstreben, werden ihr Urteil empfangen. Denn die Gewalt haben, muss man nicht fürchten wegen guter, sondern wegen böser Werke. Willst du dich aber nicht fürchten vor der Obrigkeit, so tue Gutes, dann wirst du Lob von ihr erhalten. Denn sie ist Gottes Dienerin, dir zugut. Tust du aber Böses, so fürchte dich; denn sie trägt das Schwert nicht umsonst. Sie ist Gottes Dienerin und vollzieht die Strafe an dem, der Böses tut. Darum ist es notwendig, sich unterzuordnen, nicht allein um der Strafe, sondern auch um des Gewissens willen. Deshalb zahlt ihr ja auch Steuer; denn sie sind Gottes Diener, auf diesen Dienst beständig bedacht.

There is hardly anything left of Roman Innsbruck in the cityscape. Exhibits can be admired in the Tyrolean State Museum Ferdinandeum. In various excavation projects, burial sites and remains such as walls, coins, bricks and everyday objects from the Roman period in Innsbruck were found around today's Wilten Abbey. The centre of the Leuthauses next to the monastery dates back to Roman times. One of the Roman milestones of the former main road over the Brenner Pass can be seen in Wiesengasse near the Tivoli Stadium.