Question: When was Herbert Blöcker's native province captured by Prussia and the Austrian Empire?

full_context: Document 1: Herbert Blöcker: Herbert Blöcker (January 1, 1943 – February 15, 2014) was a German equestrian and 3-time Olympic medalist. He was born in Schleswig-Holstein. He won a silver medal at the Olympics in Fontainebleau in 1980 following by winning another silver in eventing at the 1992 Summer Olympics in Barcelona. During the same Olympic event he won a bronze medal too and then participated in the 1996 Summer Olympics in Atlanta, Georgia. In 2008, both he and his Olympic horse, "Feine Dame", were inducted into the International Association of Eventing Hall of Fame. Blöcker died of cancer on February 15, 2014 at the age of 71 in Elmshorn.
Document 2: Gerhard Oechsle: Gerhard Oechsle is a West German bobsledder who competed in the early 1980s. He won a silver medal in the four-man event at the 1983 FIBT World Championships in Lake Placid, New York.
Document 3: Schleswig-Holstein-Sonderburg: Schleswig-Holstein-Sonderburg was the name of a branch line of the House of Oldenburg as well as the name of their land. It existed from 1564 until 1668 and was a titular duchy under the King of Denmark, rather than a true territorial dukedom in its own right. The seat of the duke was Sonderburg. Parts of the domain were located in Denmark (in the Duchy of Schleswig), mainly on the islands of Als and Ærø and around Glücksburg, whilst other lands were part of the Holy Roman Empire (in the Duchy of Holstein), including the "Ämter" of Plön, Ahrensbök, and Reinfeld. As a result of various inheritance arrangements it fragmented into numerous small territories which were eventually absorbed into Greater Denmark in the 18th century.
Document 4: Nick Skelton: Nicholas David Skelton, CBE (born 30 December 1957, Bedworth, Warwickshire) is a former British equestrian who competed in show jumping. He retired at the age of 59 years old, on 5 April 2017. He began riding at age 18 months and in 1975 took two team silvers and an individual gold at the Junior European Championships. He has competed numerous times at the European Show Jumping Championships, winning three golds, three silvers and three bronzes both individually and with the British team over a 26-year time period. In 1980 he competed in the Alternative Olympics where he helped the British team to a silver medal. He currently holds the British Show Jumping High Jump record, which he set in 1978.
Document 5: West Prussia: The Province of West Prussia (German: "Provinz Westpreußen" ; Kashubian: "Zôpadné Prësë" ; Polish: "Prusy Zachodnie" ) was a province of the Kingdom of Prussia from 1773 to 1824 and again from 1878 (with the Kingdom itself being part of the German Empire from 1871); it also briefly formed part of the Weimar Republic's Free State of Prussia until 1919/20. It was created out of the earlier Polish province of Royal Prussia following the First Partition of Poland. In February 1920, following Germany's defeat in 1918, West Prussia was divided: the mainly Slavic-speaking central parts became the Pomeranian Voivodeship of the Second Polish Republic, also known as the Polish Corridor; the city of Danzig became the Free City of Danzig, a semi-autonomous city-state under the protection of the League of Nations; the remaining territory was retained by the Free State of Prussia/Weimar Republic, with the western parts being joined to what remained of the former Province of Posen to form the new Posen-West Prussia Province, and the eastern parts being joined to the Province of East Prussia as Regierungsbezirk West Prussia. The territory was included within Reichsgau Danzig-West Prussia 1939–45, after which it became part of Poland.
Document 6: Province of Hohenzollern: The Province of Hohenzollern (German: "Provinz Hohenzollern" ) or the Hohenzollern Lands (German: "Hohenzollernsche Lande" ) was a "de facto" province of the Kingdom of Prussia. It was created in 1850 by joining the principalities of Hohenzollern-Sigmaringen and Hohenzollern-Hechingen after both formerly independently ruling Catholic princely lines of the House of Hohenzollern had handed over their sovereignty to Prussia, ruled by the Protestant Hohenzollern branch. Both used the same dynastic coat of arms as the one used by the Prussian royal family.
Document 7: Province of Schleswig-Holstein: The Province of Schleswig-Holstein (German: "Provinz Schleswig-Holstein" , ] ) was a province of the Kingdom of Prussia and the Free State of Prussia from 1868 to 1946. It was created from the Duchies of Schleswig and Holstein, which had been conquered by Prussia and the Austrian Empire from Denmark in the Second War of Schleswig in 1864. Following the Austro-Prussian War in 1866, which ended in Austrian defeat, Schleswig and Holstein were annexed by Prussia. The province was created in 1868 and also included the Duchy of Lauenburg since 1876.
Document 8: Duchy of Holstein: The Duchy of Holstein (German: "Herzogtum Holstein" , Danish: "Hertugdømmet Holsten" ) was the northernmost state of the Holy Roman Empire, located in the present German state of Schleswig-Holstein. It was established when King Christian I of Denmark had his County of Holstein-Rendsburg elevated to a duchy by Emperor Frederick III in 1474. Holstein was ruled jointly with the Duchy of Schleswig by members of the Danish House of Oldenburg for its entire existence.
Document 9: Manfred Hoeppner: Dr. Manfred Hoeppner served as the German Democratic Republic's (GDR) top sports doctor. He and Manfred Ewald, who served as the GDR minister of sport (1961 to 1988) and president of his country's Olympic committee (1973-1990), are regarded as the architects of their country's state-sponsored system of using illicit performance-enhancing drugs, which is believed to explain GDR's Olympic success between 1972 through 1988. Hoeppner allegedly had ties to the East German secret police, the Stasi.
Document 10: Ludger Beerbaum: Ludger Beerbaum (born 26 August 1963 in Detmold, North Rhine-Westphalia) is an internationally successful German equestrian who competes in show jumping and has been ranked the No. 1 Show Jumper in the world by the FEI on multiple occasions. He is also a four-time Olympic Gold medalist team and individual.
Document 11: Schleswig-Holstein-Sonderburg-Plön: The Duchy of Schleswig-Holstein-Sonderburg-Plön (German: "Herzogtum Schleswig-Holstein-Sonderburg-Plön" ), also "Schleswig-Holstein-Plön", "Holstein-Plön" or just "Duchy of Plön", was a small sub-duchy ("Teilherzogtum") created by the physical division of the Duchy of Schleswig-Holstein-Sonderburg. Today, its remaining significance is primarily the building of Plön Castle. The Duchy of Plön was not a territorial dukedom in its own right, but a sub-division within the state structure of the duchies of Schleswig and Holstein. The scattered territorial dominion lay mostly in the southeast part of present-day German state of Schleswig-Holstein.
Document 12: William Fox-Pitt: William Fox-Pitt (born 2 January 1969) is an English equestrian who competes in eventing. His career highlights include winning three Olympic medals in the team event, with silver in 2004 and 2012, and bronze in 2008. At the World Equestrian Games, he won team gold and individual silver in 2010, and team silver and individual bronze in 2014. He also won World team medals in 2002 and 2006. At the European Championships, he has won six team gold medals, as well as Individual silver in 1997 and 2005, and Individual bronze in 2013. In 2011, he became the first rider to win five different four-star events, having won the Burghley Horse Trials a record six times (1994, 2002, 2005, 2007, 2008 and 2011), Rolex Kentucky three times (2010, 2012, 2014), Stars of Pau twice (2011, 2013), the Badminton Horse Trials twice (2004, 2015), and the Luhmühlen Horse Trials once (2008). A serious fall in 2015 left him in a coma for two weeks, but he came back to make the British eventing team and attend the 2016 Summer Olympics.
Document 13: Prussia (region): Prussia (Old Prussian: "Prūsa", German: "Preußen" , Lithuanian: "Prūsija" , Polish: "Prusy" ) is a historical region stretching from Gdańsk Bay to the end of Curonian Spit on the southeastern coast of the Baltic Sea, and extending inland as far as Masuria. The territory and inhabitants were described by Tacitus in Germania in AD 98, where Suebi, Goths and other Germanic people lived on both sides of the Vistula River, adjacent to Aesti (further east). About 800–900 years later the Aesti were named Old Prussians, who since AD 997 repeatedly successfully defended against take-over attempt by the newly created Duchy of the Polans. The territory of the Old Prussians and neighboring Couronians and Livonians was unified politically in the 1230s as the Teutonic Order State. Prussia was politically divided in the period 1466-1772, with western Prussia under protection of the crown of Poland-Lithuania and eastern Prussia a Polish fief until 1660. The unity of both parts of Prussia remained preserved by retaining its borders, citizenship and authonomy until western and eastern Prussia were also politically re-united under the Kingdom of Prussia. It is famous for many lakes, as well as forests and hills. Since the military conquest by the Soviet Army in 1945 and the expulsion of the inhabitants it divided between northern Poland (most of the Warmian-Masurian Voivodeship), Russia's Kaliningrad exclave, and southwestern Lithuania (Klaipėda Region). The former German state of Prussia (1701–1947) derived its name from the region.
Document 14: Marina Mohnen: Marina Mohnen (born 31 October 1978) is a 4.5 point wheelchair basketball player, who plays for Rhine River Rhinos Wiesbaden in Germany, and previously played for the Mainhatten Skywheelers, RBC Köln 99ers, BAD.S. Quartu Sant' Elena und S. Stefano Sport. She also played with the German national team that won the European title in 2005, 2007, 2009, 2011 and 2015 and was runner-up in 2013. It was also runner-up at the IWBF World Championship in Birmingham in 2010 and in Toronto 2014. She won a silver medal at the 2008 Summer Paralympics in Beijing and the 2016 Summer Paralympics in Rio, and a gold medal at the 2012 Summer Paralympics in London. The team was voted 2008 Team of the Year in disabled sports, and President Horst Köhler presented it with Germany's highest sports award, the "Silbernes Lorbeerblatt" (Silver Laurel Leaf). President Joachim Gauck awarded the team a second Silver Leaf after it won the gold medal at the 2012 Summer Paralympics and at the Summer Paralympics in 2016.
Document 15: Flag of Prussia: The state of Prussia had its origins in the separate lands of the Margraviate of Brandenburg and of the Duchy of Prussia. The Margraviate of Brandenburg developed from the medieval Northern March of the Holy Roman Empire, passing to the House of Hohenzollern in 1415. The Duchy of Prussia originated in 1525 when Albert of Brandenburg-Ansbach, a member of a cadet branch of the Hohenzollerns, secularized the eastern lands of the Teutonic Knights as a Polish fief. Prince-elector John Sigismund, Elector of Brandenburg, inherited the Duchy of Prussia in 1618, thus uniting Brandenburg and Prussia under one ruler in a personal union; the Elector's state became known as Brandenburg-Prussia. The Kingdom of Prussia formed when Elector Frederick III assumed the title of Frederick I, King in Prussia, on 18 January 1701.
ground_truth: 1864