Question: When was the Holy Roman Emperor died who awarded Ferenc József the title of "Fürst von Koháry de Csábrág et Szitnya"?
Context: The monarchs of Prussia were members of the House of Hohenzollern who were the hereditary rulers of the former German state of Prussia from its founding in 1525 as the Duchy of Prussia.  The Duchy had evolved out of the Teutonic Order, a Roman Catholic crusader state and theocracy located along the eastern coast of the Baltic Sea.  The Teutonic Knights were under the leadership of a Grand Master, the last of whom, Albert, converted to Protestantism and secularized the lands, which then became the Duchy of Prussia.  The Duchy was initially a vassal of the Kingdom of Poland, as a result of the terms of the Prussian Homage whereby Albert was granted the Duchy as part of the terms of peace following the Prussian War.  When the main line of Prussian Hohenzollerns died out in 1618, the Duchy passed to a different branch of the family, who also reigned as Electors of Brandenburg in the Holy Roman Empire.  While still nominally two different territories, Prussia under the suzerainty of Poland and Brandenburg under the suzerainty of the Holy Roman Empire, the two states are known together historiographically as Brandenburg-Prussia.  Following the Second Northern War, a series of treaties freed the Duchy of Prussia from any vassalage to any other state, making it a fully sovereign Duchy in its own right.  This complex situation (where the Hohenzollern ruler of the independent Duchy of Prussia was also a subject of the Holy Roman Emperor as Elector of Brandenburg) laid the eventual groundwork for the establishment of the Kingdom of Prussia in 1701.  For diplomatic reasons, the rulers of the state were known as the King in Prussia from 1701 to 1772; largely because they still owed fealty to the Emperor as Electors of Brandenburg, the "King in Prussia" title (as opposed to "King of Prussia") avoided offending the Emperor.  As the Prussian state grew through several wars and diplomatic moves throughout the 18th century, it became apparent that Prussia had become a Great Power that did not need to submit meekly to the Holy Roman Empire.  By 1772, the pretense was dropped, and the style "King of Prussia" was adopted.  Thus it remained until 1871, when in the aftermath of the Franco-Prussian War, the King of Prussia Wilhelm I was crowned German Emperor.  From that point forward, though the Kingdom of Prussia retained its status as a constituent state of the German Empire, all remaining Kings of Prussia also served as German Emperor, and that title took precedence. The House of Saxe-Coburg-Gotha-Koháry is the Catholic cadet branch of the House of Saxe-Coburg and Gotha.  It was founded after the marriage of Prince Ferdinand of Saxe-Coburg and Gotha with Princess Maria Antonia Koháry de Csábrág.  Among its descendants were the last four kings of Portugal (Pedro V, Luis I, Carlos I, Manuel II) and the last three Tsars of Bulgaria (Ferdinand I, Boris III, Simeon II). Princess Victoria of Saxe-Coburg and Gotha (Victoria Franziska Antonia Juliane Luise; 14 February 1822 – 10 December 1857) was the daughter of Prince Ferdinand of Saxe-Coburg and Gotha and Maria Antonia Koháry de Csábrág.  Her father was the second son of Francis Frederick, Duke of Saxe-Coburg-Saalfeld and Augusta Reuss-Ebersdorf. Karl Alexander, 5th Prince of Thurn and Taxis, full German name: "Karl Alexander Fürst von Thurn und Taxis" (22 February 1770, Imperial City of Regensburg, Holy Roman Empire, 15 July 1827, Schloss Taxis, Dischingen, Kingdom of Württemberg) was the fifth Prince of Thurn and Taxis, head of the Thurn-und-Taxis-Post, and Head of the Princely House of Thurn and Taxis from 13 November 1805 until his death on 15 July 1827.  With the death of his father on 13 November 1805, he became nominal "Generalpostmeister" of the Imperial Reichspost until the resignation of Francis II, Holy Roman Emperor. Karl Anselm, 4th Prince of Thurn and Taxis, full German name: "Karl Anselm Fürst von Thurn und Taxis" (2 June 1733, Frankfurt am Main, Free Imperial City of Frankfurt, Holy Roman Empire – 13 November 1805, Winzer bei Regensburg, Electorate of Bavaria, Holy Roman Empire) was the fourth Prince of Thurn and Taxis, Postmaster General of the Imperial Reichspost, and Head of the Princely House of Thurn and Taxis from 17 March 1773 until his death on 13 November 1805.  Karl Anselm served as "Prinzipalkommissar" at the Perpetual Imperial Diet in Regensburg for Joseph II, Holy Roman Emperor and Francis II, Holy Roman Emperor from 1773 to 1797. Charles-Joseph Lamoral, 7th Prince de Ligne in French; in German Karl-Joseph Lamoral 7.  Fürst von Ligne (also known as Karl Fürst von Ligne or "Fürst de Ligne" Béla Ferenc József Grünwald de Bártfa (Hungarian: "bártfai Grünwald Béla Ferenc József" ; 2 December 1839 – 4 May 1891) was a Hungarian nationalist politician and historian active in Upper Hungary, present-day Slovakia.  Born in Szentantal, he trained as a lawyer, receiving a degree from the Royal University of Pest.  Serving first as administrator ("alispán") of Zólyom County, in the 1878 elections he was elected a member of the Hungarian House of Representatives for Szliács (modern Sliač) in that county as a member of the Liberal Party; he subsequently left the Liberals in 1880, serving as an independent before joining the Moderate Opposition party.  He was an activist for the assimilationist policies of Magyarisation in the predominantly Slovak region of Upper Hungary, founding and supporting the Upper Hungary Magyar Educational Society.  He viewed the construction of a centralised state as a political priority. Ferenc József, 1st Prince Koháry de Csábrág et Szitnya (Vienna, 4 September 1767 – Oroszvár, 27 June 1826), was a Hungarian magnate and statesman.  He was a member of the noble House of Koháry and served as Hungarian Chancellor.  On 15 November 1815, Emperor Francis I of Austria awarded him the title of "Fürst von Koháry de Csábrág et Szitnya". Francis II (German: "Franz" ; 12 February 1768 – 2 March 1835) was the last Holy Roman Emperor, ruling from 1792 until 6 August 1806, when he dissolved the Holy Roman Empire of the German Nation after the decisive defeat at the hands of the First French Empire led by Napoleon at the Battle of Austerlitz.  In 1804, he had founded the Austrian Empire and became Francis I, the first Emperor of Austria, ruling from 1804 to 1835, so later he was named the one and only "Doppelkaiser" (double emperor) in history. Holy Roman Empress or Empress of the Holy Roman Empire is the title given to the consort (wife) or regent of the Holy Roman Emperor.  The elective dignity of Holy Roman Emperor was restricted to males only, therefore there was never a Holy Roman Empress regnant, though women such as Theophanu or Maria Theresa of Austria, who controlled the power of rule, served as de facto Empresses regnant.
Answer: 2 March 1835