Question: Leopold VI, was the Duke of Syria from 1194, and had the title of which medieval principality, of the Holy Roman Empire, from 1198 to his death in 1230?

Context paragraphs:
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.

Uniformity policy: The uniformity policy was the concept of implementing Swedish law to the dominions of Sweden during the latter's time as an empire.  It is symbolized by the slogan unus rex, una lex et grex unus ("one king, one law, one people") possibly coined by Johan Skytte, governor-general in Swedish Estonia, Ingria and Livonia.  However, the phrase is also found in the debates on the possible union of Scotland and England in 1607, when Sir Edwyn Sandys noted King James VI & I's view that for a perfect union there should be unus rex, unus grex, una lex.  Most notably, the uniformity policy aimed at abolishing serfdom then common in Estonia, Livonia and the Swedish dominons in the Holy Roman Empire (Ingermanland naturally had a free peasantry).  While implemented in Livonia against the will of the local Baltic German nobles, the Estonian and Pomeranian peasants remained serfs: Estonia had voluntarily submitted to Sweden and thus had been given leeway in keeping the traditional local law code, while Swedish Pomerania had retained its traditional law code when, on behalf of the then ruling Swedish high nobility, the Peace of Westphalia granted it to Sweden while remaining part of the Holy Roman Empire, and not in a formal cession which would have resulted in the implementation of Swedish law.  Swedish law was thus only introduced to Swedish Pomerania after the dissolution of the Holy Roman Empire in 1806.

Duchy of Württemberg: The Duchy of Württemberg (German: "Herzogtum Württemberg" ) was a duchy located in the south-western part of the Holy Roman Empire.  It was a member of the Holy Roman Empire from 1495 to 1806.  The dukedom's long survival for nearly four centuries was mainly due to its size, being larger than its immediate neighbors.  During the Protestant Reformation, Württemberg faced great pressure from the Holy Roman Empire to remain a member.  Württemberg resisted repeated French invasions in the 17th and 18th centuries.  Württemberg was directly in the path of French and Austrian armies who were engaged in the long rivalry between the House of Bourbon and the House of Habsburg.  In 1803, Napoleon raised the duchy to be the Electorate of Württemberg of the Holy Roman Empire, and when he abolished the Empire in 1806, the Electorate was elevated as the Kingdom of Württemberg.

Constance, Queen of Sicily: Constance (2 November 1154 – 27 November 1198) was Queen regnant of Sicily in 1194–98, jointly with her spouse from 1194 to 1197, and with her infant son Frederick II, Holy Roman Emperor, in 1198, as the heiress of the Norman kings of Sicily.  She was also Holy Roman Empress by marriage to Henry VI, Holy Roman Emperor.

Margravate of Meissen: The Margravate of Meissen (German: "Markgrafschaft Meißen" ), sometimes known as the March of Misnia (or Misnian March), was a medieval principality in the area of the modern German state of Saxony.  It originally was a frontier march of the Holy Roman Empire, created out of the vast "Marca Geronis" in 965.  The margravate was finally merged into the Saxon Electorate in 1423.

Duchy of Austria: The Duchy of Austria (German: "Herzogtum Österreich" ) was a medieval principality of the Holy Roman Empire, established in 1156 by the "Privilegium Minus", when the Margraviate of Austria ("Ostarrîchi") was detached from Bavaria and elevated to a duchy in its own right.  After the ruling dukes of the House of Babenberg became extinct, the German king Rudolf I took over the dominion as the first monarch of the Habsburg dynasty in 1276.  Thereafter, Austria became the ancestral homeland of the dynasty and the nucleus of the Habsburg Monarchy.  In 1453, the archducal title of the Austrian rulers, invented by Duke Rudolf IV in the forged "Privilegium Maius" of 1359, was officially acknowledged by the Habsburg emperor Frederick III.

Leopold VI, Duke of Austria: Leopold VI (German: "Luitpold VI.  von Österreich" , 1176 – 28 July 1230), known as Leopold the Glorious (German: "Luitpold der Glorreiche" ), was the Duke of Styria from 1194 and the Duke of Austria from 1198 to his death in 1230.  He was a member of the House of Babenberg.  He was also a member of the Chapter of the Cistercian Order.  Like his predecessors, he attempted to develop the land by founding monasteries.  His most important foundation is Lilienfeld in the Lower Austrian valley of the Traisen river, where he was buried after his death.  Besides that, he supported the then highly modern Mendicant Orders of the Franciscans and Dominicans.  He is arguably one of the greatest of the Babenbergs.

Principality of Waldeck and Pyrmont: The County of Waldeck (later the Principality of Waldeck and Principality of Waldeck and Pyrmont) was a state of the Holy Roman Empire and its successors from the late 12th century until 1929.  In 1349 the county gained Imperial immediacy and in 1712 was raised to the rank of Principality.  After the dissolution of the Holy Roman Empire in 1806 it was a constituent state of its successors: the Confederation of the Rhine, the German Confederation, the North German Confederation, the German Empire and, until 1929, the Weimar Republic.  It comprised territories in present-day Hesse and Lower Saxony, (Germany).

Schönborn family: Schönborn is a noble and mediatised former sovereign princely family from the former Holy Roman Empire.  Several members of the family have held high offices of the Roman Catholic Church and the Holy Roman Empire over the course of centuries, including as Bishops, Prince-Bishops, Cardinals and Prince-Electors.  In addition to several family members having been elected monarchs of ecclesiastical principalities—the Electorate of Mainz, the Prince-Bishopric of Würzburg, the Prince-Bishopric of Worms, the Prince-Bishopric of Speyer, the Electorate of Trier, and the Prince-Bishopric of Bamberg—the family possessed a fiefdom in Franconia that held imperial immediacy, and was thus a principality of the Holy Roman Empire, the state of Schönborn.

List of monarchs of Prussia: 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.

Supporting paragraphs: Leopold VI, Duke of Austria Duchy of Austria
Answer: Duchy of Austria