Question: Who is Jacques, Hereditary Prince Of Monaco's paternal grandfather?

Knowledge 1: Jacques, Hereditary Prince of Monaco
Jacques, Hereditary Prince of Monaco, Marquis of Baux (Jacques Honoré Rainier Grimaldi; born 10 December 2014), is the heir apparent to the Monegasque throne.He is the son of Prince Albert II and Princess Charlene and twin brother of Princess Gabriella. [SEP] Knowledge 2: Albert II, Prince of Monaco
Albert II (Albert Alexandre Louis Pierre Grimaldi; born 14 March 1958) is the reigning monarch of the Principality of Monaco and head of the princely house of Grimaldi.He is the son of Prince Rainier III and Grace, Princess of Monaco formerly Grace Kelly, the American actress.Prince Albert's sisters are Caroline, Princess of Hanover, and Princess Stéphanie.In July 2011, Prince Albert married Charlene Wittstock.Prince Albert II is one of the wealthiest royals in the world, with assets valued at more than $1 billion, which include land in Monaco and France.Although Prince Albert does not own the Prince's Palace of Monaco, he does own shares in the "Société des bains de mer de Monaco", which operates Monaco's casino and other entertainment properties in the principality.
Knowledge 1: Jacques, Hereditary Prince of Monaco
Jacques, Hereditary Prince of Monaco, Marquis of Baux (Jacques Honoré Rainier Grimaldi; born 10 December 2014), is the heir apparent to the Monegasque throne.He is the son of Prince Albert II and Princess Charlene and twin brother of Princess Gabriella. [SEP] Knowledge 2: Robert Calcagno
Robert Calcagno born 26 June 1960 is a Monegasque politician and leader who is CEO of the Oceanographic InstituteFoundation Albert I, Prince of Monaco.
Robert Calcagno has held ministerial posts in the government of the Principality of Monaco between 2006 and 2009.He now leads the Oceanographic Museum of Monaco and the Maison des océans in ParisHis commitment to the protection of the oceans, to a better balance between Humankind and Nature and, on a broader level, his involvement in the economic, social and international life of the Principality of Monaco, have made him one of the key players in the policies of H.S.H. Prince Albert II of Monaco.
Knowledge 1: Albert II, Prince of Monaco
Albert II (Albert Alexandre Louis Pierre Grimaldi; born 14 March 1958) is the reigning monarch of the Principality of Monaco and head of the princely house of Grimaldi.He is the son of Prince Rainier III and Grace, Princess of Monaco formerly Grace Kelly, the American actress.Prince Albert's sisters are Caroline, Princess of Hanover, and Princess Stéphanie.In July 2011, Prince Albert married Charlene Wittstock.Prince Albert II is one of the wealthiest royals in the world, with assets valued at more than $1 billion, which include land in Monaco and France.Although Prince Albert does not own the Prince's Palace of Monaco, he does own shares in the "Société des bains de mer de Monaco", which operates Monaco's casino and other entertainment properties in the principality. [SEP] Knowledge 2: Robert Calcagno
Robert Calcagno born 26 June 1960 is a Monegasque politician and leader who is CEO of the Oceanographic InstituteFoundation Albert I, Prince of Monaco.
Robert Calcagno has held ministerial posts in the government of the Principality of Monaco between 2006 and 2009.He now leads the Oceanographic Museum of Monaco and the Maison des océans in ParisHis commitment to the protection of the oceans, to a better balance between Humankind and Nature and, on a broader level, his involvement in the economic, social and international life of the Principality of Monaco, have made him one of the key players in the policies of H.S.H. Prince Albert II of Monaco.

Answer: Rainier III