Fadrique Alfonso, Lord of Haro
Fadrique Alfonso of Castile, 1st Señor de Haro( 1334 –1358), 25th Master of the Order of Santiago( 1342 – 1358), was the fifth illegitimate child of Alfonso XI of Castile and Eleanor of Guzman.
He was born in Seville.
James of Castile, Lord of Cameros
James of Castile( 11 July 1268 – 9 August 1284), was an infante of Castile and Lord of Cameros.
He was the youngest son of Alfonso X of Castile and Violant of Aragon.
Ferdinand IV of Castile
Ferdinand IV of Castile (6 December 1285 – 7 September 1312) called the Summoned ("el Emplazado"), was a King of Castile and León from 1295 until his death.
During his minority, his upbringing and the custody of his person were entrusted to his mother, Queen María de Molina, while his tutorship was entrusted to the "Infante" Henry of Castile the Senator, son of King Fernando III of Castile.
At that time, and also for the rest of his reign, his mother tried to placate the nobility, confronted her son's enemies, and repeatedly prevented Ferdinand IV from being dethroned.
He had to face the insubordination of the nobility, led at numerous times by his uncle, the "Infante" John of Castile, Lord of Valencia de Campos and by Juan Núñez II de Lara, who were supported in some occasions by Juan Manuel, Prince of Villena and grandson of the King Ferdinand III.
Like his predecessors on the throne, Ferdinand IV continued the "Reconquista" and, although he failed to conquer Algeciras in 1309, he captured the city of Gibraltar that same year, and in 1312 the city of Alcaudete was also conquered.
During the "Cortes" of Valladolid of 1312, he promoted the reform of the administration of justice, and that of all areas of administration, while attempting to strengthen the royal authority to the detriment of the nobility.
He died in Jaén on 7 September 1312 aged 26, and his mortal remains are now in the Royal Collegiate Church of Saint Hippolytus.
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.
María de Molina
María Alfonso Téllez de Meneses( c. 1265 – 1321), known as María de Molina, was queen consort of Castile and León from 1284 to 1295 by marriage to Sancho IV of Castile, and served as regent for her minor son Ferdinand IV( 1295- c.1301) and later her grandson Alfonso XI of Castile( 1312- 1321).
Eleanor de Guzmán
Eleanor de Guzmán(" Leonor")( 1310 – 1351) was a Castilian noblewoman and long- term mistress to Alfonso XI of Castile.
She was the mother of King Henry II of Castile.
Juan Núñez III de Lara
Juan III
Núñez de
Lara y de la Cerda( born Juan Fdez.
de la Cerda y Núñez de Lara:
1313- Burgos, 28 November 1350), Lord of Lara and Vizcaya, son of Ferdinand de la Cerda( 1275 – 1322) and Juana Núñez de Lara" the Little Dove".
Despite belonging to the House de la Cerda and aspiring to the Castilian- Leonese throne during the reigns of Sancho IV of Castile, Ferdinand IV of Castile and Alfonso XI of Castile, he carried the family name of his mother which corresponded to the name of his lordship.
He was Lord of Biscay by his marriage to Maria Diaz de Haro II, daughter of Don Juan de Haro" the Eye".
He was also Lord of Villafranca, Oropesa, Torrelobatón, Lerma, Paredes de Nava, Castroverde and Aguilar.
Ensign of the King and Lord Steward of Alfonso XI of Castile.
He was a great- grandson of Alfonso X the Wise, King of Castile and León, and Louis IX, King of France.
Philip of Castile, Lord of Cabrera and Ribera
Philip of Castile (Seville, 28 May 1292 – Madrid, April 1327), was an "infante of Castile", son of Sancho IV of Castile and María de Molina.
He was Lord of Cabrera and Ribera and regent of his nephew Alfonso XI of Castile.
He married his cousin Margarita de la Cerda, daughter of Alfonso de la Cerda.
Tello Alfonso, Lord of Aguilar de Campoo
Tello Alfonso of Castile (1337 – October 1370) was the seventh of the ten illegitimate children of Alfonso XI of Castile and Eleanor of Guzman.
He was a prince of Castile and First Lord of Aguilar de Campoo.
In Spanish he is known as "Tello de Castilla, Infante de Castilla; Señor de Aguilar de Campoo, de Vizcaya, de Castañeda y de Lara".
Alfonso de la Cerda
Alfonso de la Cerda, (Valladolid 1270 - Ávila 1333), called the disinherited, was the elder son of Ferdinand de la Cerda and his wife Blanche of France, and was a grandson of Alfonso X of Castile.
Alfonso and his brother Fernando were candidates for the Castilian-Leonese crown during the reigns of Sancho IV of Castile, Ferdinand IV of Castile and Alfonso XI of Castile.
In 1331, Alfonso renounced his rights and swore allegiance to Alfonso XI of Castile.

Question: Where was the place of burial of Alfonso Xi Of Castile's father?
Answer: Church of Saint Hippolytus