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Treaty of Vienna, 12 October 1866

When
1866
Where
Signing place not attested in supplied passages; the treaty's name suggests Vienna but no passage states the location; Venetia
Episodes
2

The Treaty of Vienna, signed on 3 October 1866 and ratified on 12 October, concluded the Third Italian War of Independence. It formalized the transfer of Venetia from Austria to Italy via France, following a plebiscite, marking a major step in Italian unification.

Episodes

  1. 3-12 October 1866 · Signing place not attested in supplied passages; the treaty's name suggests Vienna but no passage states the locationSigning and Ratification

    The treaty was signed on 3 October 1866 and ratified on 12 October, concluding the war between Italy and Austria.

  2. 21-22 October 1866 · VenetiaPlebiscite in Venetia

    A plebiscite held on 21 and 22 October resulted in overwhelming support for joining Italy, making the annexation effective.

Background and detail

Background. The treaty concluded the hostilities of the Third War of Italian Independence, a theatre of the concurrent Austro-Prussian War. It confirmed the terms of the 12 August Armistice of Cormons, resulting in the transfer of Venetia and most of Friuli to the French Empire, who then gave the region to Italy after a referendum.

Terms. The treaty forced Austria to recognize the sovereignty of the new Italian kingdom. It required Italy to pay a cash indemnity for Austrian forts in Venetia and assume the state debt accumulated under Austrian control. The annexation became effective only after a plebiscite held on 21 and 22 October.

Consequences. The treaty represented the final division of the Habsburg ruled Kingdom of Lombardy–Venetia. For Austria, it was a national humiliation, ending influence on the Italian Peninsula established by the Congress of Vienna. It was a major milestone for the Unification of Italy, bringing Venice and the Veneto into the Italian State.

People involved

Sources

  1. Treaty of Vienna (1866) Wikipedia, revision of 2025-10-03
  2. Third Italian War of Independence Wikipedia, revision of 2026-10-04

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.