Question: Who is Prince Hermann Friedrich Of Leiningen's paternal grandmother?

Knowledge 1: Prince Hermann Friedrich of Leiningen
Prince Hermann Friedrich of Leiningen (born 16 April 1963) is the younger son of Prince Karl of Leiningen and his wife Princess Marie Louise of Bulgaria.Hermann was born in Toronto, Ontario, as Hermann Friedrich Fernando Roland.Through his mother, Hermann is a grandson of King Boris III of Bulgaria, a great-grandson of King Victor Emmanuel III of Italy and great-great-grandson of King Nicholas of Montenegro.Through his father, he is a great-great-great grandson of Queen Victoria (thus in the line of succession to the throne of Canada and those of the other Commonwealth realms- as of May 2018, he was 151st), as well as Tsar Alexander II of Russia.According to Marlene Eilers, Hermann of Leiningen belongs to the Eastern Orthodox Church.His paternal grandmother wasGrand Duchess Maria Kirillovna Romanova of Russia and his maternal grandmother was Princess Giovanna of Savoia, daughter of King Victor Emmanuel III of Italy.On 16 May 1987, in Oakville (near Toronto), Hermann married Deborah Cully (born 2 December 1961, in Belfast), daughter of Robert and Myrna Ruth Cully.They have three children:Hermann works in London for RBC Global Asset Management Inc., a division of the Royal Bank of Canada.He uses the name "Hermann Leiningen" professionally. [SEP] Knowledge 2: Prince Karl of Leiningen
Prince Karl Vladimir Ernst Heinrich of Leiningen (2 January 1928 – 28 September 1990) was the younger son of Karl, 6th Prince of Leiningen (1898–1946) and Grand Duchess Maria Kirillovna of Russia.Maria was the daughter of Princess Victoria Melita of Edinburgh and Saxe-Coburg-Gotha and Cyril Vladimirovich, Grand Duke of Russia.As such, Karl was a great-great-grandson of both Queen Victoria of Great Britain and Emperor Alexander II of Russia (as Victoria Melita and Cyril Vladimirovich were both grandchildren of Alexander II).
Knowledge 1: Prince Hermann Friedrich of Leiningen
Prince Hermann Friedrich of Leiningen (born 16 April 1963) is the younger son of Prince Karl of Leiningen and his wife Princess Marie Louise of Bulgaria.Hermann was born in Toronto, Ontario, as Hermann Friedrich Fernando Roland.Through his mother, Hermann is a grandson of King Boris III of Bulgaria, a great-grandson of King Victor Emmanuel III of Italy and great-great-grandson of King Nicholas of Montenegro.Through his father, he is a great-great-great grandson of Queen Victoria (thus in the line of succession to the throne of Canada and those of the other Commonwealth realms- as of May 2018, he was 151st), as well as Tsar Alexander II of Russia.According to Marlene Eilers, Hermann of Leiningen belongs to the Eastern Orthodox Church.His paternal grandmother wasGrand Duchess Maria Kirillovna Romanova of Russia and his maternal grandmother was Princess Giovanna of Savoia, daughter of King Victor Emmanuel III of Italy.On 16 May 1987, in Oakville (near Toronto), Hermann married Deborah Cully (born 2 December 1961, in Belfast), daughter of Robert and Myrna Ruth Cully.They have three children:Hermann works in London for RBC Global Asset Management Inc., a division of the Royal Bank of Canada.He uses the name "Hermann Leiningen" professionally. [SEP] Knowledge 2: Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Knowledge 1: Prince Hermann Friedrich of Leiningen
Prince Hermann Friedrich of Leiningen (born 16 April 1963) is the younger son of Prince Karl of Leiningen and his wife Princess Marie Louise of Bulgaria.Hermann was born in Toronto, Ontario, as Hermann Friedrich Fernando Roland.Through his mother, Hermann is a grandson of King Boris III of Bulgaria, a great-grandson of King Victor Emmanuel III of Italy and great-great-grandson of King Nicholas of Montenegro.Through his father, he is a great-great-great grandson of Queen Victoria (thus in the line of succession to the throne of Canada and those of the other Commonwealth realms- as of May 2018, he was 151st), as well as Tsar Alexander II of Russia.According to Marlene Eilers, Hermann of Leiningen belongs to the Eastern Orthodox Church.His paternal grandmother wasGrand Duchess Maria Kirillovna Romanova of Russia and his maternal grandmother was Princess Giovanna of Savoia, daughter of King Victor Emmanuel III of Italy.On 16 May 1987, in Oakville (near Toronto), Hermann married Deborah Cully (born 2 December 1961, in Belfast), daughter of Robert and Myrna Ruth Cully.They have three children:Hermann works in London for RBC Global Asset Management Inc., a division of the Royal Bank of Canada.He uses the name "Hermann Leiningen" professionally. [SEP] Knowledge 2: Karl, Prince of Leiningen
Karl, Prince of Leiningen( 13 February 18982 August 1946) was the son of Emich, 5th Prince of Leiningen.He was the 6th Prince of Leiningen from 1939 until his death.

Answer: Grand Duchess Maria Kirillovna of Russia