Question: Austria relinquished its control over the Netherlands due to the signing of a treaty which occurred on which date?
Context: The Netherlands entry for the Eurovision Song Contest 2010 will be organised by TROS.  In November a poll conducted by private broadcaster RTL 4 revealed that 86% of those polled would agree to a possible withdraw by the Netherlands due to the poor results received in past contests. The Treaty of Campo Formio (today Campoformido) was signed on 18 October 1797 (27 Vendémiaire VI) by Napoleon Bonaparte and Count Philipp von Cobenzl as representatives of the French Republic and the Austrian monarchy, respectively.  The treaty followed the armistice of Leoben (18 April 1797), which had been forced on the Habsburgs by Napoleon's victorious campaign in Italy.  It definitively ended the War of the First Coalition and left Great Britain fighting alone against revolutionary France. The Treaty of Constantinople was signed on January 25, 1479, which officially ended the fifteen-year war between the Republic of Venice and the Ottoman Empire.  The agreement was established as a result of the Ottomans having reached the outskirts of Venice.  Based on the terms of the treaty, the Venetians were allowed to keep Ulcinj, Antivan, and Durrës.  However, they ceded Shkodra (which had been under Ottoman siege for many months), as well as other territories on the Dalmatian coastline, as well as relinquished control of the Greek islands of Negroponte (Euboea) and Lemnos.  Moreover, the Venetians were forced to pay 100,000 ducat indemnity and agreed to a tribute of around 10,000 ducats per year in order to acquire trading privileges in the Black Sea.  As a result of this treaty, Venice acquired a weakened position in the Levant. The Circle of the Rhine (German: "Rheinkreis" ) or Rhine Circle, sometimes the Bavarian Rheinkreis ("bayerischer Rheinkreis " or "baierischer Rheinkreis "), was the name given to the territory on the west bank of the Rhine from 1816 to 1837 which was one of 15 (later 8) administrative districts of the Kingdom of Bavaria.  Before the French revolutionary wars (1792) most of the land had belonged to the Electoral Palatinate.  At the Congress of Vienna in 1815 it was initially promised to the Empire of Austria after having been under a provisional joint Austro-Bavarian administration since 1814.  However, in the Treaty of Munich (1816), Austria relinquished the territory to Bavaria. The Treaty of Rhandeia was a peace treaty concluded between the Roman Empire and the Parthian Empire at the frontier town of Rhandeia in what is now Turkey in 63.  The treaty, which finalized the Roman–Parthian War of 58–63, stipulated that henceforth a Parthian prince of the Arsacid line would sit on the Armenian throne, but his nomination, or right of investiture, was given to the emperor of Rome.  Even though this made Armenia a client kingdom, various contemporary Roman sources thought that Nero had de facto ceded Armenia to the Parthian Empire.  This compromise between Parthia and Rome lasted for several decades, until 114, when Rome under Trajan took direct control of Arsacid Armenia and incorporated it into a short-lived Roman province that lasted for a mere four years; it was outwardly relinquished under Trajan's successor Hadrian in 118. L'houcine "Aussie" Ouzgni (born 10 March 1984) is a Dutch-Moroccan Light Heavyweight/Middleweight Muay Thai kickboxer fighting out of Amsterdam, Netherlands for Top Team Beverwijk.  Aussie is a firm fan favorite in the Netherlands due to his exciting style and knockout power, likened to a smaller version of fellow Dutch fighter Badr Hari.  He is a three time Dutch national Muay Thai champion, currently competing within the It's Showtime organization. Ovídio de Sousa Martins (September 17, 1928 in Mindelo, São Vicente – April 29, 1999 in Lisbon, Portugal) was a famous Cape Verdean poet and journalist.  He attended high school in his home country, he went to pursue studies in Portugal and did not achieve studies due to health reasons.  He was one of the founders of the "Cultural Supplement Bulletin of Cape Verde" in 1958.  He lived in exile in the Netherlands due to his pro-independence activities in his native land and produced 100 poems there. The Austrian Netherlands (German: "Österreichische Niederlande" ; French: "Pays-Bas Autrichiens" ; Dutch: "Oostenrijkse Nederlanden" ; Latin: "Belgium Austriacum" ) was the Southern Netherlands between 1714 and 1797.  The period began with the acquisition of the territory by the Habsburg Monarchy under the Treaty of Rastatt in 1714 and lasted until its annexation during the aftermath of the Battle of Sprimont in 1794 and the Peace of Basel in 1795.  Austria, however, did not relinquish its claim over the province until 1797 in the Treaty of Campo Formio.  The Austrian Netherlands was a noncontiguous territory that consisted of what is now western Belgium as well as greater Luxembourg, bisected by the Prince-Bishopric of Liège.  The dominant languages were German (including Luxembourgish), Dutch (Flemish), and French, along with Picard and Walloon. The Fokker F.XVIII was an airliner produced in the Netherlands in the early 1930s, essentially a scaled-up version of the Fokker F.XII intended for long-distance flights.  Like its predecessor, it was a conventional high-wing cantilever monoplane with fixed tailwheel undercarriage.  Its cabin could seat 12 passengers, or four-to-six on seats convertible to sleeping berths.  Only five were built, all for KLM, and registered as PH-AIO, 'AIP, 'AIQ, 'AIR and 'AIS, all of which were named after birds.  Used by KLM on its Amsterdam-Batavia route, the F.XVIII became celebrated in the Netherlands due to two especially noteworthy flights.  In December 1933, one aircraft (registration "PH-AIP", "Pelikaan" - "Pelican") was used to make a special Christmas mail flight to Batavia, completing the round trip in a flight time of 73 hours 34 minutes.  The following Christmas, another F.XVIII (registration "PH-AIS", "Snip" - "Snipe") made a similar flight to Curaçao in 55 hours 58 minutes after having been specially re-engined for the journey. The style of the Dutch sovereign has changed many times since the establishment of the Kingdom of the Netherlands due to formations and dissolutions of personal unions, as well as due to marriages of female sovereigns and cognatic successions.
Answer: 18 October 1797