Question: The mother of Joseph Ferdinand of Bavaria died in what year? 

Context paragraphs:
Prince Leopold of Bavaria (born 1943): Prince Leopold (Poldi) of Bavaria (German: "Leopold Rupprecht Ludwig Ferdinand Adalbert Friedrich Maria et omnes sancti Prinz von Bayern" ) (born 21 June 1943) is a member of the Bavarian royal house of Wittelsbach and a former champion race car driver.  He descends from King Ludwig I of Bavaria in direct line and is a distant relative to the current head of the House of Wittelsbach, Franz, Duke of Bavaria and his brother, Maximilian, Duke in Bavaria.  He also descends from Austrian Emperor Franz Joseph and his wife Elisabeth and from King George II of Great Britain, and is therefore a distant cousin of Elizabeth II.  As a Roman Catholic he is excluded from the line for the British throne by the Act of Settlement 1701.  He also descends from Isabella II of Spain, through her daughter, and Leopold´s great-grandmother, María de la Paz.

Maria Antonia of Austria: Maria Antonia of Austria (Maria Antonia Josepha Benedicta Rosalia Petronella; 18 January 1669 – 24 December 1692) was the eldest daughter and only surviving child of Holy Roman Emperor Leopold I and his wife Margaret Theresa of Spain.  She became Electress of Bavaria when she married in 1685, but died prematurely in 1692.

Prince Joseph Ferdinand of Saxe-Coburg and Gotha: Prince Joseph Ferdinand of Saxe-Coburg and Gotha (full name "Joseph Ferdinand Maria Michael Gabriel Raphael Gonzaga"; 21 May 1869 – 13 August 1888), known in Brazil as Dom José Fernando, was a prince of the House of Saxe-Coburg and Gotha-Koháry.  Born in Leopoldina Palace, Rio de Janeiro, he was the third son of Prince Ludwig August of Saxe-Coburg and Gotha and his wife Princess Leopoldina of Brazil.  He died in Wiener Neustadt and is buried at St. Augustin, Coburg.

Treaty of The Hague (1698): The Treaty of Den Haag (also known as the Treaty of The Hague or the First Partition Treaty) was signed on October 11, 1698 between England and France.  The accord attempted to resolve who would inherit the Spanish throne, proposing that Joseph Ferdinand of Bavaria be the heir.  Moreover, the agreement proposed that Louis, "le Grand Dauphin", would receive Naples, Sicily, Finale, and the ports in Tuscany while Archduke Charles, the younger son of Holy Roman Emperor Leopold I would receive the Spanish Netherlands.  Leopold, Duke of Lorraine, would take Milan, which in turn ceded Lorraine and Bar to the Dauphin.

Archduke Franz Salvator of Austria: Archduke Franz Salvator of Austria, in Italian Francesco Salvatore Maria Giuseppe Ferdinando Carlo Leopoldo Antonio di Padova Giovanni Battista Gennaro Lodovico Gonzaga Raniero Benedetto Bernardo, in German Franz Salvator Maria Joseph Ferdinand Karl Leopold Anton von Padua Johann Baptist Januarius Aloys Gonzaga Rainer Benedikt Bernhard (Altmünster, 21 August 1866 – Vienna, 20 April 1939), was a member of the Tuscan branch of the House of Habsburg.

Prince Ferdinand of Bavaria: Prince Ferdinand of Bavaria (Ferdinand Maria Ludwig Franz von Assisi Isabellus Adalbert Ildefons Martin Bonifaz Joseph Isidro; 10 May 1884 – 5 April 1958) was a Spanish prince, the eldest son and child of Ludwig Ferdinand of Bavaria and his wife Infanta María de la Paz of Spain.  Ferdinand became an Infante of Spain on 20 October 1905 and renounced his rights to the throne of the Kingdom of Bavaria in 1914.

Treaty of London (1700): The Treaty of London, agreed on March 25, 1700 and sometimes known as the Second Partition Treaty, was an attempt to restore the Pragmatic Sanction following the death of Joseph Ferdinand of Bavaria, which had undermined the First Partition Treaty (the Treaty of Den Haag).  Under the new Treaty, Archduke Charles (later Emperor Charles VI), the second son of the Emperor Leopold I, was to succeed King Charles II of Spain on his thrones and acquire his oversees colonies.

Joseph Ferdinand of Bavaria: Joseph Ferdinand Leopold of Bavaria (28 October 1692 – 6 February 1699) was the son of Maximilian II Emanuel, Elector of Bavaria (1679–1705, 1714–1726) and his first wife, Maria Antonia of Austria, daughter of Leopold I, Holy Roman Emperor, maternal granddaughter of King Felipe IV of Spain.

Ferdinand of Bavaria (soldier): Ferdinand of Bavaria was born 20 January 1550, in Landshut, in the Duchy of Bavaria, and died 30 January 1608 in Munich, at the age of 58.  He was the second surviving son of Albert V, Duke of Bavaria, and his wife Archduchess Anna of Austria, and consequently was prepared for a military career.  Ferdinand is also known for the two extraordinary diaries he kept, one as fifteen-year-old boy on a journey from Munich to Florence, for his aunt's wedding, and a second journey to Florence, this time as young and experienced man of affairs.

Ferdinand Hérold: Louis Joseph Ferdinand Hérold (28 January 1791 – 19 January 1833), better known as Ferdinand Hérold (] ), was a French operatic composer of Alsatian descent who also wrote many pieces for the piano, orchestra, and the ballet.  He is best known today for the ballet "La fille mal gardée" and the overture to the opera "Zampa".

Supporting paragraphs: Joseph Ferdinand of Bavaria Maria Antonia of Austria
Answer: 1692