Question: What was the family of Joachim II Hector, former elector of the town where the Sophienfließ river is located?

full_context: Document 1: Joachim, 6th Prince Murat: Joachim Murat, 6th Prince Murat (Paris, Île-de-France, France, August 6, 1885 – Paris, Île-de-France, France May 11, 1938), was a member of the Bonaparte-Murat family.
Document 2: Huguenots: Frederick William, Elector of Brandenburg, invited Huguenots to settle in his realms, and a number of their descendants rose to positions of prominence in Prussia. Several prominent German military, cultural, and political figures were ethnic Huguenot, including poet Theodor Fontane, General Hermann von François, the hero of the First World War Battle of Tannenberg, Luftwaffe General and fighter ace Adolf Galland, Luftwaffe flying ace Hans-Joachim Marseille, and famed U-boat captain Lothar von Arnauld de la Perière. The last Prime Minister of the (East) German Democratic Republic, Lothar de Maizière, is also a descendant of a Huguenot family, as is the German Federal Minister of the Interior, Thomas de Maizière.
Document 3: Schermützelsee: The Schermützelsee is a lake in Brandenburg, Germany. It is located in the town of Buckow in the district Märkisch-Oderland northwest of Müncheberg and east of the Berlin centre. With its surface area of 1.37 km² it is the largest water in the hill country „Märkische Schweiz“ and in the Märkische Schweiz Nature Park.
Document 4: East Prussia: The Administrator of Prussia, the grandmaster of the Teutonic Order Maximilian III, son of emperor Maximilian II died in 1618. When Maximilian died, Albert's line died out, and the Duchy of Prussia passed to the Electors of Brandenburg, forming Brandenburg-Prussia. Taking advantage of the Swedish invasion of Poland in 1655, and instead of fulfilling his vassal's duties towards the Polish Kingdom, by joining forces with the Swedes and subsequent treaties of Wehlau, Labiau, and Oliva, Elector and Duke Frederick William succeeded in revoking king of Poland's sovereignty over the Duchy of Prussia in 1660. The absolutist elector also subdued the noble estates of Prussia.
Document 5: Rhine: Between Bingen and Bonn, the Middle Rhine flows through the Rhine Gorge, a formation which was created by erosion. The rate of erosion equaled the uplift in the region, such that the river was left at about its original level while the surrounding lands raised. The gorge is quite deep and is the stretch of the river which is known for its many castles and vineyards. It is a UNESCO World Heritage Site (2002) and known as "the Romantic Rhine", with more than 40 castles and fortresses from the Middle Ages and many quaint and lovely country villages.
Document 6: Planfließ: Planfließ is a river of Brandenburg, Germany. It flows into the Großer Treppelsee, which is drained by the Schlaube, near Bremsdorf.
Document 7: Schwärze: Schwärze is a river of Brandenburg, Germany. It flows into the Finow Canal, which discharges into the Oder, in Eberswalde.
Document 8: Joachim II Hector, Elector of Brandenburg: Joachim II ( or "Hektor"; 13 January 1505 – 3 January 1571) was a Prince-elector of the Margraviate of Brandenburg (1535–1571), the sixth member of the House of Hohenzollern. Joachim II was the eldest son of Joachim I Nestor, Elector of Brandenburg and his wife Elizabeth of Denmark, Norway, and Sweden. He received the cognomen Hector after the Trojan prince and warrior for his qualities and prowess.
Document 9: Sophienfließ: Sophienfließ is a river in the hill country „Märkische Schweiz“ and the Märkische Schweiz Nature Park, District Märkisch-Oderland, Brandenburg, Germany. The stream runs over a distance of approximately .
Document 10: Plane (river): The Plane is a river in Brandenburg, Germany, left tributary of the Havel. Its total length is . The Plane originates in the High Fläming Nature Park, near Rabenstein. It flows north through Planetal and Golzow. The Plane joins the Havel in the Breitlingsee lake west of Brandenburg an der Havel.
Document 11: Thuringia: The most important river in Thuringia is the Saale (a tributary of the Elbe) with its tributaries Unstrut, Ilm and Weiße Elster, draining the most parts of Thuringia and the Werra (the headwater of the Weser), draining the south-west and west of the Land. Furthermore, some small parts on the southern border are drained by tributaries of the Main (a tributary of the Rhine). There are no large natural lakes in Thuringia, but it does have some of Germany's biggest dams including the Bleiloch Dam and the Hohenwarte Dam at Saale river same as the Leibis-Lichte Dam and the Goldisthal Pumped Storage Station within the Highland. Thuringia is Germany's only state without connection to navigable waterways.
Document 12: East Prussia: Although Brandenburg was a part of the Holy Roman Empire, the Prussian lands were not within the Holy Roman Empire and were with the administration by the Teutonic Order grandmasters under jurisdiction of the Emperor. In return for supporting Emperor Leopold I in the War of the Spanish Succession, Elector Frederick III was allowed to crown himself "King in Prussia" in 1701. The new kingdom ruled by the Hohenzollern dynasty became known as the Kingdom of Prussia. The designation "Kingdom of Prussia" was gradually applied to the various lands of Brandenburg-Prussia. To differentiate from the larger entity, the former Duchy of Prussia became known as Altpreußen ("Old Prussia"), the province of Prussia, or "East Prussia".
Document 13: Wiesent (Regnitz): Wiesent is a river located in Bavaria, Germany. It is a right tributary of the river Regnitz. It is the main river of the Franconian Switzerland region, rising near the village Steinfeld. It flows through the towns Hollfeld, Muggendorf and Ebermannstadt, and joins the Regnitz in Forchheim.
Document 14: Albert Wolfgang, Count of Hohenlohe-Langenburg: He was head of the House of Hohenlohe-Langenburg and introduced primogeniture in Langenburg in 1699. This meant the oldest son would inherit the entire county, and younger sons would only inherit if the oldest were to die childless. From then on, younger sons would mostly embark on military careers, for example, in the imperial army, or in friendly nations.
Document 15: Prince Johann Georg of Hohenzollern: Prince Johann Georg was the sixth child of Frederick, Prince of Hohenzollern (Heiligendamm 30 August 1891 – Krauchenwies 6 February 1965) and his wife Princess Margarete Karola of Saxony (Dresden 24 January 1900 – Freiburg im Breisgau 16 October 1962).
ground_truth: House of Hohenzollern
sub_queries: Sophienfließ >> located in the administrative territorial entity Answer: Brandenburg
Joachim II Hector, Elector of Brandenburg >> family Answer: House of Hohenzollern