Hector de Castro
Hector de Castro( 1849 – January 30, 1909) was an Ottoman born American businessman and diplomat.
Born in Constantinople, de Castro was educated in Paris and Vienna.
He emigrating to the United States and was naturalized in 1885.
He became Vice President of the American Cable Company.
Resigned from American Cable Company in 1890 to accept position as Secretary of the Intercontinental Railroad Commission In 1890, de Castro married Grace Aldrich of New York.
The couple had no children.
In 1897, de Castro was appointed United States General Consul in Rome.
Mrs. de Castro died in January 1908 and de Castro transferred to the General Consul position in Zurich in June the same year.
De Castro died from nephritis on January 30, 1909.
He was buried in Rome.
Gutierre Rodríguez de Castro
Gutierre Rodríguez de Castro also known as Gutierre Ruiz de Castro and nicknamed el Escalabrado( died) was a Castilian nobleman, member of the House of Castro as the son of Rodrigo Fernández de Castro and his wife Elo Álvarez, daughter of Álvar Fáñez and his wife Mayor Pérez, daughter of Count Pedro Ansúrez.
Pedro Rodríguez de Castro
Pedro Rodríguez de Castro (fl. 1171–1191), second son of Rodrigo Fernández de Castro the bald and Eylo Álvarez, daughter of Álvar Fáñez, and of the Countess Mayor Perez, was a Castilian nobleman of the lineage of the Castro.
Just like his great-grandfather, count Pedro Ansúrez, he was Butler of Leon in 1184 and tenente of Grado, Tineo, Pravia, and Limia.
The Count of Barcelos in his "Nobiliario", and Argote de Molina in his nobility of Andalusia, called him "the monk" as he entered religion after becoming a widower.
He was married before 1171 to Urraca Guzmán Rodríguez, daughter of Rodrigo Muñoz de Guzmán and Mayor Díaz, who possibly had no offspring.
On 19 December 1187, king Alfonso VIII of Castile, in thanks for joining the services of the Castilian Crown, donated to him the villas of Villasila and Villamelendro.
Pedro Rodríguez de Castro died after 22 November 1191, date of its last appearance in medieval documentation.
Pedro Rodríguez (cardinal)
Pedro Rodríguez de Quexada or Petrus Hispanus( died 20 December 1310, in Avignon) was an ecclesiastic from Castile.
Rodrigo Fernández de Castro
Rodrigo Fernández de Castro (died after 1144), called the Bald ("el Calvo"), was a Castilian nobleman and soldier.
One of the founders of the House of Castro, he was the second son of Fernando García de Hita and Tegridia (or Trigidia), sister or aunt of Count Rodrigo Martínez and relative of the Ansúrez family.
His paternal grandfather may have been García Ordóñez, who died at the battle of Uclés in 1108.
Leonor Rodríguez de Castro
Leonor Rodríguez de Castro( died after 20 December 1275) was an infanta of the Kingdom of Castile as the third wife of Philip of Castile.
Juana de Castro
Juana de Castro( died 21 August 1374) was queen of Castile, as wife of King Peter of Castile and sister of Inês de Castro.
She was the daughter of Pedro Fernández de Castro and Isabel Ponce de Leon.
She married King Peter in 1354.
Her tomb is in the Santiago de Compostela Cathedral.
Pedro Rodríguez (racing driver)
Pedro Rodríguez de la Vega( 18 January 1940 – 11 July 1971) was a Mexican Grand Prix motor racing driver.
He was the older brother of Ricardo Rodríguez.
Fernando Rodríguez de Castro (died 1304)
Fernando Rodríguez de Castro( died 1304), was a Galician noble and a member of the House of Castro.
He was the son of Esteban Fernández de Castro, Lord of Lemos and Sarria, and Alzonza Rodríguez de León.
His paternal grandparents were Fernando Gutiérrez de Castro and Emilia Iniguez de Mendoza.
His maternal grandparents were Rodrigo Alfonso de León, son of Alfonso IX of León, and Ines Rodríguez Cabrera.
Following the death of his father, Esteban Fernández de Castro, Fernando became Lord of Lemos and Sarria.
In 1293, he married Violante Sánchez of Castile, illegitimate daughter of Sancho IV of Castile.
He was one of the most powerful and influential nobles of Galicia, like most members of the House of Castro.
In 1304, Fernando took up arms against Ferdinand IV of Castile, by attacking Philip of Castile, who was in Galicia besieging the fortress of Monforte de Lemos.
Fernando's advisers tried to persuade him to reach a peace agreement with the Felipe, who was brother of Violente Sánchez of Castile, his wife.
However, no agreement was reached and Fernando Rodriguez de Castro was killed in the ensuing battle.
Pedro Fernández de Castro
Pedro Fernández de Castro( Algeciras, 1342), nicknamed" el de la Guerra"('of the War'), was a powerful Galician noble and military figure of the House of Castro, descended by illegitimate lines from the kings of Castile- Leon- Galicia.
Pedro Fernandez de Castro was Lord(" Señor") of Lemos and Sarria and served as" mayordomo mayor"( lord steward) of Alfonso XI of Castile," adelantado de la frontera"( governor) of Andalusia, Galicia and Murcia and" pertiguero mayor"( a title similar to the French Vidame) of the lands of Santiago.
He was the father of Fernando Ruiz de Castro(" toda la lealtad de España"), Queen Juana de Castro( wife of Peter of Castile), the controversial Inês de Castro( consort King Peter I of Portugal) and Álvaro Pires de Castro.

Question: Who is Pedro Rodríguez De Castro's paternal grandfather?