Question: Who is Francisco Fernández De La Cueva, 4Th Duke Of Alburquerque's paternal grandfather?

Knowledge 1: Francisco Fernández de la Cueva, 4th Duke of Alburquerque
Francisco Fernández de la Cueva y Girón, 4th Duke of Alburquerque (in full)(c. 1510 – 1563) was a Spanish nobleman.He was the son of Don Beltrán de la Cueva, 3rd Duke of Alburquerque and of Doña Isabel Girón.He fought in Africa and participated in the siege at La Goletta and the Conquest of Tunis in 1535.He married Doña Constanza de Leiva, daughter of the principe di Ascoli, and later (1549)Doña María Fernández dela Córdoba, daughter of Luis Fernández de Córdoba, 2nd Marquis of Comares. [SEP] Knowledge 2: Beltrán de la Cueva, 3rd Duke of Alburquerque
Beltrán de la Cueva y Toledo, 3rd Duke of Alburquerque, (in full), (c. 1478 - 11 February 1560) was a Spanish nobleman and military leader.He was born in Cuéllar, the son of Don Francisco Fernández de la Cueva, 2nd Duke of Alburquerque and of Francisca de Toledo, daughter of García Álvarez de Toledo, 1st Duke of Alba.Beltrán de la Cueva was appointed captain general of the Spanish Army, and commander-in-chief of the English Army in France (under queen Mary I of England).He was named a Knight of the Order of the Golden Fleece in 1531, a Viceroy of Aragon in 1535, and a Viceroy of Navarre in 1552, position he held until his death in 1560.
Knowledge 1: Francisco Fernández de la Cueva, 4th Duke of Alburquerque
Francisco Fernández de la Cueva y Girón, 4th Duke of Alburquerque (in full)(c. 1510 – 1563) was a Spanish nobleman.He was the son of Don Beltrán de la Cueva, 3rd Duke of Alburquerque and of Doña Isabel Girón.He fought in Africa and participated in the siege at La Goletta and the Conquest of Tunis in 1535.He married Doña Constanza de Leiva, daughter of the principe di Ascoli, and later (1549)Doña María Fernández dela Córdoba, daughter of Luis Fernández de Córdoba, 2nd Marquis of Comares. [SEP] Knowledge 2: Francisco Fernández de la Cueva, 8th Duke of Alburquerque
Francisco Fernández de la Cueva y Enriquez de Cabrera, 8th Duke of Alburquerque, 6th Marquess of Cuéllar, 8th Count of Ledesma, GE, KOS (1619 – March 27, 1676) was a Spanish military officer and viceroy of New Spain from August 15, 1653 to September 15, 1660.He was also viceroy of Sicily from 1668 to 1670.
Knowledge 1: Beltrán de la Cueva, 3rd Duke of Alburquerque
Beltrán de la Cueva y Toledo, 3rd Duke of Alburquerque, (in full), (c. 1478 - 11 February 1560) was a Spanish nobleman and military leader.He was born in Cuéllar, the son of Don Francisco Fernández de la Cueva, 2nd Duke of Alburquerque and of Francisca de Toledo, daughter of García Álvarez de Toledo, 1st Duke of Alba.Beltrán de la Cueva was appointed captain general of the Spanish Army, and commander-in-chief of the English Army in France (under queen Mary I of England).He was named a Knight of the Order of the Golden Fleece in 1531, a Viceroy of Aragon in 1535, and a Viceroy of Navarre in 1552, position he held until his death in 1560. [SEP] Knowledge 2: Francisco Fernández de la Cueva, 8th Duke of Alburquerque
Francisco Fernández de la Cueva y Enriquez de Cabrera, 8th Duke of Alburquerque, 6th Marquess of Cuéllar, 8th Count of Ledesma, GE, KOS (1619 – March 27, 1676) was a Spanish military officer and viceroy of New Spain from August 15, 1653 to September 15, 1660.He was also viceroy of Sicily from 1668 to 1670.

Answer: Francisco Fernández de la Cueva, 2nd Duke of Alburquerque