Question: What is the name of the so-called reform opera for Vienna that came before the one first performed in Vienna in the presence of Empress Maria Theresa?

Passages:
Paride ed Elena (] ; "Paris and Helen") is an opera by Christoph Willibald Gluck.  It is the third of Gluck's so-called reform operas for Vienna, following "Alceste" and "Orfeo ed Euridice", and the least often performed of the three.  Like its predecessors, the libretto was written by Ranieri de' Calzabigi.  The opera tells the story of the events between the Judgment of Paris and the flight of Paris and Helen to Troy.  It was premiered at the Burgtheater in Vienna on 3 November 1770. Gottlieb Muffat (April 1690 – 9 December 1770), son of Georg Muffat, served as "Hofscholar" under Johann Fux in Vienna from 1711 and was appointed to the position of third court organist at the "Hofkapelle" in 1717.  He acquired additional duties over time including the instruction of members of the Imperial family, among them the future Empress Maria Theresa.  He was promoted to second organist in 1729 and first organist upon the accession of Maria Theresa to the throne in 1741.  He retired from official duties at the court in 1763. Maria Theresa (German: Maria Theresia) is a 1951 Austrian historical drama film directed by  Emil E. Reinert and starring  Paula Wessely, Fred Liewehr and Marianne Schönauer.  It portrays the life of the eighteenth century Habsburg Empress Maria Theresa. Orfeo ed Euridice (French version: Orphée et Eurydice ; English: "Orpheus and Eurydice") is an opera composed by Christoph Willibald Gluck based on the myth of Orpheus, set to a libretto by Ranieri de' Calzabigi.  It belongs to the genre of the "azione teatrale", meaning an opera on a mythological subject with choruses and dancing.  The piece was first performed at the Burgtheater in Vienna on 5 October 1762 in the presence of Empress Maria Theresa.  "Orfeo ed Euridice" is the first of Gluck's "reform" operas, in which he attempted to replace the abstruse plots and overly complex music of "opera seria" with a "noble simplicity" in both the music and the drama. <P3-S0> Romolo ed Ersilia is an opera in three acts composed by Johann Adolph Hasse to an Italian-language libretto by Pietro Metastasio. <P3-S1>  The opera was commissioned by Empress Maria Theresa to celebrate the marriage of her son Leopold to Maria Luisa of Spain. <P3-S2>  The opera was first performed on 6 August 1765, the day after their wedding, in the court theatre of the Imperial Palace in Innsbruck. <P3-S3>  The opera received its first performance in modern times in 2011 during the Innsbruck Festival of Early Music. Alfred Ritter von Arneth (10 July 181930 July 1897) was an Austrian historian.  His principal scholarly work is a ten-volume biography of the Habsburg Empress Maria Theresa, first published in installments from 1863 to 1879 and still regarded as the standard work on the subject.  Born at Vienna, he was the son of Joseph Calasanza von Arneth (1791–1863), a well-known historian and archaeologist, who wrote a history of the Austrian Empire (Vienna, 1827) and several works on numismatics and brother of Doctor Franz Hektor von Arneth (1818–1907). Maria Theresa or Maria Theresia most often refers to Empress Maria Theresa (1717-1780), Queen of Hungary and Bohemia, Archduchess of Austria and ruler of the rest of the Habsburg Empire (1740-1780). <P1-S0> The Maria Theresa thaler (MTT) is a silver bullion coin that has been used in world trade continuously since they were first minted in 1741, at that time using the then Reichsthaler standard of 9 thalers to the Vienna mark. <P1-S1>  In 1750 the thaler was debased to 10 thalers to the Vienna Mark (a weight approximating half a pound of fine silver). <P1-S2>  The following year the new standard was effectively adopted across the German-speaking world when that standard was accepted formally in the Bavarian monetary convention. <P1-S3>  It is owing to the date of the Bavarian Monetary convention that many writers erroneously state that the Maria Theresa Thaler was first struck in 1751. <P1-S4>  It was named after Empress Maria Theresa, who ruled Austria, Hungary, and Bohemia from 1740 to 1780. <P1-S5>  The word "thaler" gave rise to "daalder" and "daler", which became "dollar" in English. Adam František Kollár de Keresztén (German: "Adam Franz Kollar von Keresztén" , Hungarian: "kereszténi Kollár Ádám Ferenc" ; 1718–1783) was a Slovak jurist, Imperial-Royal Court Councilor and Chief Imperial-Royal Librarian, a member of Natio Hungarica in the Kingdom of Hungary, a historian, ethnologist, an influential advocate of Empress Maria Theresa's Enlightened and centralist policies.  His advancement of Maria Theresa's status in the Kingdom of Hungary as its apostolic ruler in 1772 was used as an argument in support of the subsequent Habsburg annexations of Galicia and Dalmatia.  Kollár is also credited with coining the term "ethnology" and providing its first definition in 1783.  Some authors see him as one of the earliest pro-Slovak, pro-Slavic, and pan-Slavic activists in the Habsburg Monarchy. Maria Theresa of Austria (21 March 1801 – 12 January 1855) was born an Archduchess of Austria and Princess of Tuscany.  She was a daughter of Ferdinand III, Grand Duke of Tuscany, and Luisa of Naples and Sicily.  She was named after her double great grandmother Empress Maria Theresa.  In 1817, she married Charles Albert of Sardinia and subsequently became the Queen of Sardinia upon her husband's accession to the throne in 1831.

Supporting sentences:
Orfeo ed Euridice (French version: Orphée et Eurydice ; English: "Orpheus and Eurydice") is an opera composed by Christoph Willibald Gluck based on the myth of Orpheus, set to a libretto by Ranieri de' Calzabigi.  The piece was first performed at the Burgtheater in Vienna on 5 October 1762 in the presence of Empress Maria Theresa.