Question: Who is the maternal grandfather of Otto Von Habsburg?

Knowledge 1: Otto von Habsburg
Otto von Habsburg (20 November 1912 4 July 2011), also known by his traditional royal title of Archduke Otto of Austria, was the last Crown Prince of Austria-Hungary from 1916 until the dissolution of the empire in 1919, a realm which comprised modern-day Austria, Hungary, Bosnia and Herzegovina, Croatia, the Czech Republic, Slovakia, Slovenia, and parts of Italy, Montenegro, Poland, Romania, Serbia and Ukraine.He became the pretender to the former thrones, Head of the House of Habsburg-Lorraine, and Sovereign of the Order of the Golden Fleece in 1922, upon the death of his father.He resigned as Sovereign of the Golden Fleece in 2000 and as head of the Imperial House in 2007.The eldest son of Charles I and IV, the last Emperor of Austria and King of Hungary, and his wife, Zita of Bourbon-Parma, Otto was born as third in line to the thrones, as Archduke Otto of Austria, Royal Prince of Hungary, Bohemia, and Croatia.With his father's accession to the thrones in 1916, he was likely to become emperor and king.As his father never abdicated, Otto was considered by himself, his family and Austro-Hungarian legitimists to be the rightful emperor-king from 1922.Otto was active on the Austrian and European political stage from the 1930s, both by promoting the cause of Habsburg restoration and as an early proponent of European integration—being thoroughly disgusted with nationalism—and a fierce opponent of Nazism and communism.He has been described as one of the leaders of the Austrian Resistance.After the 1938 "Anschluss", where monarchists were severely persecuted in Austria and sentenced to death by the Nazis, Otto fled Europe to the United States.Otto von Habsburg was Vice President (1957–1973) and President (1973–2004) of the International Paneuropean Union, and served as a Member of the European Parliament for the Christian Social Union of Bavaria (CSU) from 1979 to 1999.As a newly elected Member of the European Parliament in 1979, Otto had an empty chair set up for the countries on the other side of the Iron Curtain in the European Parliament, and took a strong interest in the countries behind the Iron Curtain.Otto von Habsburg played a notable role in the revolutions of 1989, as a co-initiator of the Pan-European Picnic.Later he was a strong supporter of the EU membership of central and eastern European countries.A noted intellectual, he published several books on historical and political affairs.Otto has been described as one of the "architects of the European idea and of European integration" together with Robert Schuman, Konrad Adenauer, and Alcide De Gasperi.Otto was exiled in 1919 and grew up mostly in Spain.His devout Catholic mother raised him according to the old curriculum of Austria-Hungary, preparing him to become a Catholic monarch.During his life in exile, he lived in Switzerland, Madeira, Spain, Belgium, France, the United States, and from 1954 until his death, finally in Bavaria (Germany), in the residence "Villa Austria".At the time of his death, he was a citizen of Germany, Austria, Hungary, and Croatia ,having earlier been stateless "de jure" and "de facto", and possessed passports of Monaco, the Order of Malta, and Spain.His funeral took place at St. Stephen's Cathedral in Vienna on 16 July 2011; he was entombed in the Imperial Crypt in Vienna and his heart buried in Pannonhalma Archabbey in Hungary. [SEP] Knowledge 2: Zita of Bourbon-Parma
Zita of Bourbon-Parma ("Zita Maria delle Grazie Adelgonda Micaela Raffaela Gabriella Giuseppina Antonia Luisa Agnese"; 9 May 1892 – 14 March 1989) was the wife of Charles, the last monarch of Austria-Hungary.As such, she was the last Empress of Austria and Queen of Hungary, in addition to other titles.Born as the seventeenth child of the dispossessed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, Zita married the then Archduke Charles of Austria in 1911.Charles became heir presumptive to the Emperor Franz JosephI of Austria in 1914 after the assassination of his uncle Archduke Franz Ferdinand of Austria, and acceded to the throne in 1916 after the old emperor's death.After the end of World War I in 1918, the Habsburgs were deposed and the empire became four independent countries, Austria, Hungary, and the newly formed Czechoslovakia and State of Slovenes, Croats and Serbs.Charles and Zita left for exile in Switzerland and were subsequently removed from Hungary by the Allies to Madeira, where Charles died in 1922.After her husband's death, Zita and her son Otto served as symbols of unity for the exiled dynasty.A devout Catholic, she raised a large family after being widowed at the age of 29, and never remarried.
Knowledge 1: Otto von Habsburg
Otto von Habsburg (20 November 1912 4 July 2011), also known by his traditional royal title of Archduke Otto of Austria, was the last Crown Prince of Austria-Hungary from 1916 until the dissolution of the empire in 1919, a realm which comprised modern-day Austria, Hungary, Bosnia and Herzegovina, Croatia, the Czech Republic, Slovakia, Slovenia, and parts of Italy, Montenegro, Poland, Romania, Serbia and Ukraine.He became the pretender to the former thrones, Head of the House of Habsburg-Lorraine, and Sovereign of the Order of the Golden Fleece in 1922, upon the death of his father.He resigned as Sovereign of the Golden Fleece in 2000 and as head of the Imperial House in 2007.The eldest son of Charles I and IV, the last Emperor of Austria and King of Hungary, and his wife, Zita of Bourbon-Parma, Otto was born as third in line to the thrones, as Archduke Otto of Austria, Royal Prince of Hungary, Bohemia, and Croatia.With his father's accession to the thrones in 1916, he was likely to become emperor and king.As his father never abdicated, Otto was considered by himself, his family and Austro-Hungarian legitimists to be the rightful emperor-king from 1922.Otto was active on the Austrian and European political stage from the 1930s, both by promoting the cause of Habsburg restoration and as an early proponent of European integration—being thoroughly disgusted with nationalism—and a fierce opponent of Nazism and communism.He has been described as one of the leaders of the Austrian Resistance.After the 1938 "Anschluss", where monarchists were severely persecuted in Austria and sentenced to death by the Nazis, Otto fled Europe to the United States.Otto von Habsburg was Vice President (1957–1973) and President (1973–2004) of the International Paneuropean Union, and served as a Member of the European Parliament for the Christian Social Union of Bavaria (CSU) from 1979 to 1999.As a newly elected Member of the European Parliament in 1979, Otto had an empty chair set up for the countries on the other side of the Iron Curtain in the European Parliament, and took a strong interest in the countries behind the Iron Curtain.Otto von Habsburg played a notable role in the revolutions of 1989, as a co-initiator of the Pan-European Picnic.Later he was a strong supporter of the EU membership of central and eastern European countries.A noted intellectual, he published several books on historical and political affairs.Otto has been described as one of the "architects of the European idea and of European integration" together with Robert Schuman, Konrad Adenauer, and Alcide De Gasperi.Otto was exiled in 1919 and grew up mostly in Spain.His devout Catholic mother raised him according to the old curriculum of Austria-Hungary, preparing him to become a Catholic monarch.During his life in exile, he lived in Switzerland, Madeira, Spain, Belgium, France, the United States, and from 1954 until his death, finally in Bavaria (Germany), in the residence "Villa Austria".At the time of his death, he was a citizen of Germany, Austria, Hungary, and Croatia ,having earlier been stateless "de jure" and "de facto", and possessed passports of Monaco, the Order of Malta, and Spain.His funeral took place at St. Stephen's Cathedral in Vienna on 16 July 2011; he was entombed in the Imperial Crypt in Vienna and his heart buried in Pannonhalma Archabbey in Hungary. [SEP] Knowledge 2: Francesca von Habsburg
Francesca von Habsburg- Lothringen( born 7 June 1958) is an art collector and the estranged wife of Karl von Habsburg, current head of the House of Habsburg- Lorraine.
Knowledge 1: Otto von Habsburg
Otto von Habsburg (20 November 1912 4 July 2011), also known by his traditional royal title of Archduke Otto of Austria, was the last Crown Prince of Austria-Hungary from 1916 until the dissolution of the empire in 1919, a realm which comprised modern-day Austria, Hungary, Bosnia and Herzegovina, Croatia, the Czech Republic, Slovakia, Slovenia, and parts of Italy, Montenegro, Poland, Romania, Serbia and Ukraine.He became the pretender to the former thrones, Head of the House of Habsburg-Lorraine, and Sovereign of the Order of the Golden Fleece in 1922, upon the death of his father.He resigned as Sovereign of the Golden Fleece in 2000 and as head of the Imperial House in 2007.The eldest son of Charles I and IV, the last Emperor of Austria and King of Hungary, and his wife, Zita of Bourbon-Parma, Otto was born as third in line to the thrones, as Archduke Otto of Austria, Royal Prince of Hungary, Bohemia, and Croatia.With his father's accession to the thrones in 1916, he was likely to become emperor and king.As his father never abdicated, Otto was considered by himself, his family and Austro-Hungarian legitimists to be the rightful emperor-king from 1922.Otto was active on the Austrian and European political stage from the 1930s, both by promoting the cause of Habsburg restoration and as an early proponent of European integration—being thoroughly disgusted with nationalism—and a fierce opponent of Nazism and communism.He has been described as one of the leaders of the Austrian Resistance.After the 1938 "Anschluss", where monarchists were severely persecuted in Austria and sentenced to death by the Nazis, Otto fled Europe to the United States.Otto von Habsburg was Vice President (1957–1973) and President (1973–2004) of the International Paneuropean Union, and served as a Member of the European Parliament for the Christian Social Union of Bavaria (CSU) from 1979 to 1999.As a newly elected Member of the European Parliament in 1979, Otto had an empty chair set up for the countries on the other side of the Iron Curtain in the European Parliament, and took a strong interest in the countries behind the Iron Curtain.Otto von Habsburg played a notable role in the revolutions of 1989, as a co-initiator of the Pan-European Picnic.Later he was a strong supporter of the EU membership of central and eastern European countries.A noted intellectual, he published several books on historical and political affairs.Otto has been described as one of the "architects of the European idea and of European integration" together with Robert Schuman, Konrad Adenauer, and Alcide De Gasperi.Otto was exiled in 1919 and grew up mostly in Spain.His devout Catholic mother raised him according to the old curriculum of Austria-Hungary, preparing him to become a Catholic monarch.During his life in exile, he lived in Switzerland, Madeira, Spain, Belgium, France, the United States, and from 1954 until his death, finally in Bavaria (Germany), in the residence "Villa Austria".At the time of his death, he was a citizen of Germany, Austria, Hungary, and Croatia ,having earlier been stateless "de jure" and "de facto", and possessed passports of Monaco, the Order of Malta, and Spain.His funeral took place at St. Stephen's Cathedral in Vienna on 16 July 2011; he was entombed in the Imperial Crypt in Vienna and his heart buried in Pannonhalma Archabbey in Hungary. [SEP] Knowledge 2: Karl-Konstantin von Habsburg
Karl-Konstantin von Habsburg( Given names: Karl-Konstantin Michael Stephan Maria; born on 20 July 2004 in Budapest) referred to in Austria as Karl- Konstantin Habsburg- Lothringen, in Hungary as Habsburg Károly Konstantin, and also as Archduke Karl- Konstantin of Austria, is the only son of Georg von Habsburg and Duchess Eilika of Oldenburg., he is considered third in line of succession to the former Austro- Hungarian throne.He is the great- grandson of Emperor Charles I of Austria through his grandfather Otto von Habsburg.Through his maternal grandfather, he is a descendant of George II of Great Britain, and would therefore be in line for the British throne were he not a Catholic and barred by the Act of Settlement.

Answer: Robert I