The mountainous area then mainly was a transit country along Roman roads crossing the Eastern Alps like the Via Claudia Augusta, settled by Romanised Illyrian and Raeti tribes which had adopted the Vulgar Latin (Ladin) language.
He ceded the counties of Trento, Bolzano and Vinschgau to the Trent bishops and finally separated the territory on the east bank of the Adige River down to Mezzocorona (Deutschmetz) from the Imperial Kingdom of Italy.
The Gau of Norital, including the Wipptal, the Eisacktal and the Val Badia, was granted to the newly established Prince-Bishopric of Brixen, followed in 1091 by the Puster Valley.
Over the centuries, the episcopal reeves (Vögte) residing at Tirol Castle near Merano extended their territory over much of the region and came to surpass the power of the bishops who were nominally their feudal lords.
Also in this period, from the late twelfth to the thirteenth centuries, have been established along the Brenner axis almost all of up-today's existing urban settlements, which can be categorized as marked-formed, not very densely populated small-towns, such as Bolzano, Merano, Sterzing or Bruneck.
Following defeat by Napoleon in 1805, the Austrian Empire was forced to cede the northern part of Tyrol to the Kingdom of Bavaria in the Peace of Pressburg.
Under the secret Treaty of London, signed in April 1915, Italy agreed to declare war against the Central Powers in exchange for (among other things) territorial gains in the Austrian crown lands of Tyrol, Küstenland and Dalmatia, homeland of large Italian minorities.
Under the secret Treaty of London (1915), Italy "shall obtain the Trentino, Cisalpine Tyrol with its geographical and natural frontier (the Brenner frontier)"[7] and after the ceasefire of Villa Giusti (November 3, 1918) Italian troops occupied uncontested the territory and as stipulated in the ceasefire agreement marched into North Tyrol and occupied Innsbruck and the Inn valley.
[8] During the negotiations between Austria and the victorious Entente powers in Saint-Germain a petition for help, signed by all the mayors of South Tyrol, was presented to US President Woodrow Wilson.
It has been claimed that Wilson later complained about the annexation: "Already the president had, unfortunately, promised the Brenner Pass boundary to Orlando, which gave to Italy some 150,000 Tyrolese Germans-an action which he subsequently regarded as a big mistake and deeply regretted.
People were not allowed to cross, and the postal service and the flow of goods were interrupted; censorship was introduced and officials not born in the area were dismissed.
On December 1, 1919 the King promised in a speech: "a careful maintenance of local institutions and self-administration"[8][14] Italy formally annexed the territories on October 10, 1920.
The Governatorato included the present-day region of Trentino-Alto Adige/Südtirol and the three Ladin communes of Cortina, Colle Santa Lucia and Livinallongo, today in the Province of Belluno.
The General Civil Commissioner of the province, Luigi Credaro, had been warned in advance by his colleagues from Mantua, Brescia, Verona and Vicenza of the intention of the fascists there to go to Bolzano-Bozen to disrupt the procession, but did not take any precautions.
Mussolini made clear his policies regarding the people of South Tyrol:[8][9][14] "If the Germans on both sides of the Brenner don't toe the line, then the fascists will teach them a thing or two about obedience.
In Italy, there are hundreds of thousands of Fascists who would rather lay waste to Alto Adige than to permit the tricolore that flies above the Vetta d’Italia to be lowered.
Among other things it decreed: The first forms of opposition to the regime appeared in 1925: a priest, Michael Gamper, opened the first "Katakombenschulen", clandestine schools where teachers taught in German.
[17] In this period of oppression, National Socialist propaganda became more and more successful among young South Tyroleans,[9] leading in 1934 to the formation of the illegal local Nazi organization of the Völkischer Kampfring Südtirols (VKS).
Hitler writes in Book II of Mein Kampf, "But I do not hesitate to declare that, now the dice have fallen, I not only regard a reconquest of the South Tyrol by war as impossible, but that I personally would reject it in the conviction that for this question the flame of national enthusiasm of the whole German people could not be achieved to a degree which would offer the premise for victory.
"[20] In 1939, both dictators in order to solve any further dispute agreed to give the German-speaking population a choice in the South Tyrol Option Agreement: they could emigrate to neighbouring Germany (including annexed Austria) or stay in Italy and accept complete Italianisation.
There was a plan to relocate the Optanten in Crimea (annexed to Greater Germany), but most were resettled in German-annexed Western Poland, where they were expelled or killed after the war.
When the US 88th Infantry Division occupied South Tyrol from May 2 to May 8, 1945, and after the total unconditional surrender of Germany on May 8, 1945, it found vast amounts of precious items and looted art treasures.
[21] In 1945 the South Tyrolean People's Party (Südtiroler Volkspartei) was founded, mainly by Dableiber, who had elected to stay in Italy after the agreement between Hitler and Mussolini.
The second phase was bloodier, costing 21 lives (among them four activists and 15 Italian policemen and soldiers), four of them during a BAS ambush at Cima Vallona, province of Belluno, on 25 June 1967.
Eventually, international (especially Austrian) public opinion and domestic considerations led the Italian government to consider a "Second statutory order" and to negotiate a package of reforms that produced the "Autonomy Statute", which virtually delinked the mostly German-speaking province of South Tyrol from the Trentino.
The new autonomous status, granted from 1972 onwards, has resulted in a considerable level of self-government, also due to the large financial resources of the province of Bolzano/Bozen, retaining almost 90% of all levied taxes.
It has strong relations with the Austrian state of Tyrol, especially since Austria's 1995 entry into the European Union, which has led to a common currency and a de facto disappearance of the borders.