Kieran Bew
Kieran Bew( born 18 August 1980) is an English actor, known for portraying Alfonso, Duke of Calabria in" Da Vinci's Demons" for Starz, for Hallmark Entertainment and Gary Parr in Jimmy McGovern's BAFTA Award- winning" The Street".
He has worked extensively in British theatre and television since graduating from LAMDA in 2001.
Infanta Alicia, Duchess of Calabria
Infanta Alicia of Spain, Duchess of Calabria (née: "
Princess Alicia Maria Teresa Francesca Luisa Pia Anna Valeria of Bourbon-Parma"; 13 November 1917 – 28 March 2017) was a daughter of Elias, Duke of Parma, and Archduchess Maria Anna of Austria.
Alicia was Duchess of Calabria through her marriage to Infante Alfonso, Duke of Calabria (1901–1964).
She bore the title of Infanta of Spain from 1936, and took part in some of the activities that the Spanish Royal Family organises.
Through marriage, she was maternal half-aunt of Juan Carlos I of Spain.
She was born in Vienna, Austria-Hungary, and died in Madrid, Spain.
She was paternal first cousin of Boris III of Bulgaria, and paternal half-first cousin of Jean, Grand Duke of Luxembourg, Otto, Crown Prince of Austria and Queen Anne of Romania.
Infante Alfonso, Duke of Calabria
Infante Alfonso of Spain, Prince of the Two Sicilies, Duke of Calabria (30 November 1901 – 3 February 1964) was one of two claimants to the title of the head of the House of Bourbon-Two Sicilies from 1960 until his death in 1964.
Alfonso was the son of Prince Carlos of Bourbon-Two Sicilies (1870–1949) and his wife, Mercedes, Princess of Asturias (1880–1904).
He was born and died in Madrid, Spain.
Alfonso's mother was Mercedes, Princess of Asturias, but she died in childbirth in 1904.
King Alfonso XIII of Spain was unmarried at the time so as the Princess of the Asturias' eldest son, Alfonso became heir-presumptive to the Spanish crown, though, unlike his mother, he never held the title of Prince of Asturias.
He was heir-presumptive until the birth of his cousin, Alfonso in 1907, to Alfonso XIII and Queen Victoria Eugenie.
Princess Anne, Duchess of Calabria
Princess Anne of Bourbon- Two Sicilies, Dowager Duchess of Calabria(" née" Princess Anne d' Orléans; born 4 December 1938) is the widow of Infante Carlos, Duke of Calabria.
She is the third daughter and fifth child of Prince Henri, Count of Paris( 1908 – 1999), Orléanist claimant to the defunct French throne, and his wife Princess Isabelle of Orléans- Braganza( 1911–2003).
Prince Ataúlfo de Orleans
Ataúlfo de Orleans( 20 October 1913 – 8 October 1974), was a Spanish prince, the youngest son of Infante Alfonso, Duke of Galliera and Princess Beatrice of the United Kingdom.
He was President of Real Club de la Puerta de Hierro from 1962 to 1966.
Ippolita Maria Sforza
Ippolita Maria Sforza( 18 April 1446 – 20 August 1484) was an Italian noble woman, a member of the Sforza family which ruled the Duchy of Milan from 1450 until 1535.
She was the first wife of Alfonso, Duke of Calabria, who later reigned as King Alfonso II of Naples.
Prince Carlos of Bourbon-Two Sicilies
Don Carlos, Prince of Bourbon-Two Sicilies, Infante of Spain
(Full Italian name: "Carlo Maria Francesco d'Assisi Pasquale Ferdinando Antonio di Padova Francesco de Paola Alfonso Andrea Avelino Tancredi, Principe di Borbone delle
Due Sicilie, Infante di Spagna";
10 November 1870, , Bolzano, Austria-Hungary – 11 November 1949, Seville, Spain) was the son of Prince Alfonso of the Two Sicilies, Count of Caserta and his wife Princess Maria Antonietta of Bourbon-Two Sicilies, and nephew of the last King of the Two Sicilies, Francis II.
Prince Pedro, Duke of Calabria
Prince Pedro of Bourbon- Two Sicilies, Duke of Calabria
( Spanish:" Pedro Juan María Alejo Saturnino y Todos los Santos"; born 16 October 1968), is the only son of Infante Carlos, Duke of Calabria( 1938 – 2015) and his wife, Princess Anne of Orléans.
Dinis of Braganza, Count of Lemos
Dinis of Braganza( 1481 – 1516) was the younger son of Fernando II, Duke of Braganza and Isabella of Viseu who was a daughter of Infante Fernando, Duke of Viseu and Beatrice of Portugal.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.

Question: Who is Infante Alfonso, Duke Of Calabria's paternal grandfather?
Answer: Prince Alfonso