Question: Austria relinquished its control over the Netherlands due to the signing of a treaty which occurred on which date?

 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 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. <SEP> 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. <SEP>  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. The Austrian Netherlands (German: "Österreichische Niederlande" ; French: "Pays-Bas Autrichiens" ; Dutch: "Oostenrijkse Nederlanden" ; Latin: "Belgium Austriacum" ) was the Southern Netherlands between 1714 and 1797.  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. <SEP> 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.