Alfonso XI of Castile
Alfonso XI of Castile (13 August 131126 March 1350), called the Avenger ("el Justiciero"), was the king of Castile, León and Galicia.
He was the son of Ferdinand IV of Castile and his wife Constance of Portugal.
Upon his father's death in 1312, several disputes ensued over who would hold regency, which were resolved in 1313.
Once Alfonso was declared adult in 1325, he began a reign that would serve to strengthen royal power.
His achievements include solving the problems of the Gibraltar Strait and the conquest of Algeciras.
William Bourchier, 1st Count of Eu
William Bourchier, 1st Count of Eu( 1374- 28 May 1420), was an English knight created by King Henry V 1st Count of Eu, in Normandy.
João Afonso Telo, 4th Count of Barcelos
João Afonso
Telo de Menezes( died 1381) was a Portuguese nobleman, 1st Count of Ourém, 1st Count of Viana do Alentejo, and 4th Count of Barcelos.
Tirso de Olazábal, 1st Count of Arbelaiz
Tirso de Olazábal y Lardizábal, 1st Count of Arbelaiz, 1st Count of Oria( 28 January 1842 – 25 November 1921), was a Spanish noble and Carlist politician.
Sancho Alfonso, 1st Count of Alburquerque
Sancho Alfonso de Castilla (1342–1374) is known in Spanish as "Don Sancho Alfonso de Castilla, Infante de Castilla, I conde de Alburquerque".
He was the ninth of the ten illegitimate children of King Alfonso XI of Castile and Lady Eleanor de Guzmán.
He was born in Seville.
He participated in a revolt of the Castilian nobles against the despotic rule of his brother, Pedro of Castile.
In 1373 he married Beatrice of Portugal, daughter of Peter I of Portugal and Inês de Castro.
They had two children:
Fernando Sánchez, 2nd Count of Alburquerque, and Eleanor of Alburquerque, who married Ferdinand I of Aragon.
He also had an illegitimate daughter, Leonor Sánchez de Castilla, who married Fadrique de Castilla y Ponce de Leon, illegitimate son of Henry II, King of Castile.
Francisco de Mascarenhas
Francisco de Mascarenhas was the 1st count of Vila da Horta, the 1st count of Santa Cruz and the 13th viceroy of Portuguese controlled India from 1581 until 1584, captain of donatary of the islands of Flores and Corvo.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Beatrice, Countess of Alburquerque
Beatrice of Portugal was Countess of Alburquerque as the wife of Sancho Alfonso of Alburquerque.
She was the daughter of Peter I of Portugal and his wife Inês de Castro.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Question: Who is Sancho Alfonso, 1St Count Of Alburquerque's paternal grandmother?
Answer: Constance of Portugal