Question: What is the name of the elder brother emperor that signed the Truce of Ratisbon?

full_context: Document 1: Truce of Ratisbon: The Truce of Ratisbon, or Truce of Regensburg, concluded the War of the Reunions between Spain and France. The Truce was signed on 15 August 1684 at the Dominican convent at Ratisbon in Bavaria between Louis XIV of France on the one side, and the Holy Roman Emperor, Leopold I, and the Spanish King, Charles II, on the other. The final agreements allowed King Louis to retain Strasbourg, Luxembourg, and other Reunion gains, and Kortrijk and Diksmuide, both now in Belgium, were returned to Spain. It was not, however, a definitive peace but only a truce for 20 years.
Document 2: Leopold I, Holy Roman Emperor: Leopold I (name in full: "Leopold Ignaz Joseph Balthasar Felician"; Hungarian: "I. Lipót" ; 9 June 1640 – 5 May 1705) was Holy Roman Emperor, King of Hungary, Croatia, and Bohemia. The second son of Ferdinand III, Holy Roman Emperor, by his first wife, Maria Anna of Spain, Leopold became heir apparent in 1654 by the death of his elder brother Ferdinand IV. Elected in 1658, Leopold ruled the Holy Roman Empire until his death in 1705.
Document 3: Rudolf II, Holy Roman Emperor: Rudolf II (18 July 1552 – 20 January 1612) was Holy Roman Emperor (1576–1612), King of Hungary and Croatia (as Rudolf I, 1572–1608), King of Bohemia (1575–1608/1611) and Archduke of Austria (1576–1608). He was a member of the House of Habsburg.
Document 4: Reichstadt Agreement: The Reichstadt agreement was an agreement made between Austria-Hungary and Russia in July 1876, who were at that time in an alliance with each other and Germany in the League of the Three Emperors, or "Dreikaiserbund". Present were the Russian and Austro-Hungarian emperors together with their foreign ministers, Prince Gorchakov of Russia and Count Andrassy of Austria-Hungary. The closed meeting took place on July 8 in the Bohemian city of Reichstadt (now Zákupy). They agreed on a common approach to the solution of the Eastern question, due to the unrest in the Ottoman Empire and the interests of the two major powers in the Balkans. They discussed the likely Russo-Turkish War of 1877–1878, its possible outcomes and what should happen under each scenario.
Document 5: Battle of Lens: The Battle of Lens (20 August 1648) was a French victory under Louis II de Bourbon, Prince de Condé against the Spanish army under Archduke Leopold in the Thirty Years' War (1618–1648). It was the last major battle of the war. Lens is a fortified city in the historic region of Flanders, today a major city in the Pas-de-Calais region of northern France. The city had been captured by the French in 1647. The french lower nobility rebelled against the leadership of Cardinal Mazarin, an event known as the Fronde, leading the Spanish to perceive an opportunity to retake Lens and possibly gain ground.
Document 6: 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.
Document 7: Archduke Alexander Leopold of Austria: Archduke Alexander Leopold of Austria (Alexander Leopold Johann Joseph; Hungarian: "Sándor Lipót" ; 14 August 1772 – 12 July 1795) was Palatine of Hungary, appointed during the reign of his father, Holy Roman Emperor Leopold II, and serving into the reign of his elder brother, Holy Roman Emperor Francis II.
Document 8: Treaty of Paris (1814): The Treaty of Paris, signed on 30 May 1814, ended the war between France and the Sixth Coalition, part of the Napoleonic Wars, following an armistice signed on 23 April between Charles, Count of Artois, and the allies. It established peace between France and the United Kingdom of Great Britain and Ireland, Russia, Austria, and Prussia, who in March had defined their common war aim in Chaumont. The Treaty was also signed by Portugal and Sweden while Spain signed shortly after in July. Peace talks had started on 9 May between Talleyrand, who negotiated with the allies of Chaumont on behalf of the exiled Bourbon king Louis XVIII of France. The allies had agreed to reduce France to her 1792 borders and restore the independence of her neighbors after Napoleon Bonaparte's defeat. However, the allied parties did not sign a common document, but instead concluded separate treaties with France allowing for specific amendments.
Document 9: 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.
Document 10: Peace of Vasvár: The Peace of Vasvár was a treaty between the Austrian Habsburg Monarchy and the Ottoman Empire which followed the Battle of Saint Gotthard of 1 August 1664 (near Mogersdorf, Burgenland), and concluded the Austro-Turkish War (1663-1664). It held for about 20 years, until 1683, during which border skirmishing escalated to a full-scale war and culminated with the Ottoman's siege of Vienna for the second time.
Document 11: Ferdinand III, Holy Roman Emperor: Ferdinand III (13 July 1608 – 2 April 1657) was Holy Roman Emperor from 15 February 1637 until his death, as well as King of Hungary and Croatia, King of Bohemia and Archduke of Austria. He was the last emperor to have real power over the Holy Roman Empire.
Document 12: Joseph II, Holy Roman Emperor: Joseph II (Joseph Benedikt Anton Michael Adam; 13 March 1741 – 20 February 1790) was Holy Roman Emperor from 1765 to 1790 and ruler of the Habsburg lands from 1780 to 1790. He was the eldest son of Empress Maria Theresa and her husband, Emperor Francis I, and was the brother of Marie Antoinette. He was thus the first ruler in the Austrian dominions of the House of Lorraine, styled Habsburg-Lorraine. Joseph was a proponent of enlightened absolutism; however, his commitment to modernizing reforms subsequently engendered significant opposition, which eventually culminated in an ultimate failure to fully implement his programmes. He has been ranked, with Catherine the Great of Russia and Frederick the Great of Prussia, as one of the three great Enlightenment monarchs. His policies are now known as Josephinism. He died with no sons and was succeeded by his younger brother, Leopold II.
Document 13: Leopold I of Belgium: Leopold I (French: "Léopold I" , German and Dutch: "Leopold I" ; 16 December 1790 in Coburg – 10 December 1865 in Laeken) was a German prince who became the first King of the Belgians following Belgian independence in 1830. He reigned between July 1831 and December 1865.
Document 14: Ferdinand I, Holy Roman Emperor: Ferdinand I (Spanish: "Fernando I" ) (10 March 1503 – 25 July 1564) was Holy Roman Emperor from 1558, king of Bohemia and Hungary from 1526, and king of Croatia from 1527 until his death. Before his accession, he ruled the Austrian hereditary lands of the Habsburgs in the name of his elder brother, Charles V, Holy Roman Emperor. Also, he often served as Charles' representative in Germany and developed useful relationships with German princes.
Document 15: Treaty of Brussol: The Treaty of Brussol (also known as the Treaty of Bruzolo) was signed on 10 April 1610 in Bruzolo between Charles Emmanuel I, Duke of Savoy, and Henry IV of France, inside the Castle of Bruzolo, (in Susa Valley, near Turin). Based on the terms of the accord, both signatories agreed to combine their forces in order to remove the Spanish from Italy. The agreement also dictated that the Duke of Mantua exchange the province of Casale Monferrato for the province of Cremona. Also, the territories of Montferrat and Milan would be united under the control of Savoy. Under the treaty, Victor Emmanuel would be restored to the throne of Lombardy. Also, Henry IV would have his daughter marry Prince Victor Amadeus I and that the King of France, the Republic of Venice, and the Pope guarantee the Duke of Savoy the title of King of Lombardy. However, this accord was never realized since Henry IV was assassinated by Ravaillac in May 1610. Marie de' Medici, just crowned queen, fored the treaty. Even though Henry's death ended the treaty, Charles Emmanuel seized Montferrat from the Spanish in 1613, which led to a war that lasted until 1617.
ground_truth: Ferdinand IV