García Sánchez III of Pamplona
García Sánchez III( 1012 – 15 September 1054), nicknamed García from Nájera was King of Pamplona from 1034 until his death.
He was also Count of Álava and had under his personal control part of the County of Castile.
As the eldest son of Sancho III he inherited the dynastic rights over the crown of Pamplona, becoming feudal overlord over two of his brothers: Ramiro, who was given lands that would serve as the basis for the Kingdom of Aragón; and Gonzalo, who received the counties of Sobrarbe and Ribagorza.
Likewise, he had some claim to suzerainty over his brother Ferdinand, who under their father had served as Count of Castile, nominally subject to the Kingdom of León but brought under the personal control of Sancho III.
García Sánchez of Castile
García Sánchez( died 1029) was the last independent count of Castile from 1017 to his death.
Son of Sancho García and his wife Urraca, he succeeded his father when he was only a boy.
During his minority the post of regent was held by several Castilian magnates and Urraca, Abbess of Covarrubias, the young count's aunt.
The county fell under the protection of his brother- in- law, King Sancho III of Pamplona( Sancho the Great).
His sister, Jimena, was married to Bermudo III of León.
He reached his majority in 1028.
He was assassinated the next year when leaving the royal palace in León by the brothers Rodrigo Vela and Íñigo Vela.
He had gone there to meet his fiancée," Infanta" Sancha, sister of Bermudo III of León,
The countship was assigned to his nephew Ferdinand, younger son of his sister Muniadona and her husband Sancho the Great
Ferdinand I of León
Ferdinand I( 1015 – 24 December 1065), called the Great(" el Magno"), was the Count of Castile from his uncle's death in 1029 and the King of León after defeating his brother- in- law in 1037.
According to tradition, he was the first to have himself crowned Emperor of Spain( 1056), and his heirs carried on the tradition.
He was a younger son of Sancho III of Navarre and Muniadona of Castile, and by his father's will recognised the supremacy of his eldest brother, García Sánchez III of Navarre.
While Ferdinand inaugurated the rule of the Navarrese Jiménez dynasty over western Spain, his rise to preeminence among the Christian rulers of the peninsula shifted the locus of power and culture westward after more than a century of Leonese decline.
Nevertheless,"[ t] he internal consolidation of the realm of León – Castilla under Fernando el Magno and[ his queen] Sancha( 1037 – 1065) is a history that remains to be researched and written."
Sancho Ramírez
Sancho Ramírez( 1042 – 4 June, 1094) was King of Aragon from 1063 until 1094 and King of Pamplona from 1076 under the name of Sancho V.
He was the eldest son of Ramiro I and Ermesinda of Bigorre.
His father was the first king of Aragon and an illegitimate son of Sancho III of Pamplona.
He inherited the Aragonese crown from his father in 1063.
Sancho Ramírez was chosen king of Pamplona by Navarrese noblemen after Sancho IV was murdered by his siblings.
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.
Alfonso VII of León and Castile
Alfonso VII (1 March 110521 August 1157), called the Emperor ("el Emperador"), became the King of Galicia in 1111 and King of León and Castile in 1126.
Alfonso, born Alfonso Raimúndez, first used the title Emperor of All Spain, alongside his mother Urraca, once she vested him with the direct rule of Toledo in 1116.
Alfonso later held another investiture in 1135 in a grand ceremony reasserting his claims to the imperial title.
He was the son of Urraca of León and Raymond of Burgundy, the first of the House of Ivrea to rule in the Iberian peninsula.
Alfonso was a dignified and somewhat enigmatic figure.
His rule was characterised by the renewed supremacy of the western kingdoms of Christian Iberia over the eastern (Navarre and Aragón) after the reign of Alfonso the Battler.
Though he sought to make the imperial title meaningful in practice to both Christian and Muslim populations, his hegemonic intentions never saw fruition.
During his tenure, Portugal became "de facto" independent, in 1128, and was recognized as "de jure" independent, in 1143.
He was a patron of poets, including, probably, the troubadour Marcabru.
Sancho III of Castile
Sancho III (1134 – 31 August 1158), called the Desired ("el Deseado"), was King of Castile and Toledo for one year, from 1157 to 1158.
He was the son of Alfonso VII of León and Castile and his wife Berengaria of Barcelona, and was succeeded by his son Alfonso VIII.
His nickname was due to his position as the first child of his parents, born after eight years of childless marriage.
During his reign, the castle of Calatrava-la-Vieja was conceded to Abbot Raymond Serrat of Fitero, who proposed using the lay brothers of his monastery as knights to defend this castle.
These knights would give rise to the Order of Calatrava, which was confirmed in 1164 by Pope Alexander III.
It was also in his reign that the Leonese and Castilian spheres of conquest against al-Andalus were decided in the Treaty of Sahagún (May 1158), besides an exclusion of the conquering rights and a possible division of the Portuguese kingdom among the two sons of Alfonso VII, which would come to nothing possibly due to the premature death of Sancho.
Sancho III Mitarra of Gascony
Sancho III(" SanzioSantioSanxoSantzoSantxo", or" Sancio";; Gascon:" Sans"), called Mitarra( from the Arabic for" terror" or" the terrible"), Menditarra( meaning" the mountaineer" in Basque), was the Duke of Gascony in a very obscure period of its history between 864 and 893.
He was probably duke from 872 to 887.
He is shrouded in mystery and legend, but is regarded as a great fighter of the Reconquista elected to his post as Carolingian power waned by the native Gascons.
His genealogy is obscure, but he was probably a son of Sancho II Sánchez.
There is much confusion among the sources about the identity of Sancho Mitarra.
Some give that sobriquet to Sancho II, while some give it to Sancho III.
Some call the latter Mitarra Sancho and call him a son of the former.
It seems likely that these two Sanchos are related.
Genealogies of a" phantasmagorical" character assign to him a Castilian parentage.
During the reign of Sancho III, Gascony became" de facto" independent, owing no allegiance to the King of France.
He settled the Vikings at the mouth of the Adour and brought them under control.
He was succeeded by either his son( most likely) or his brother, García II Sánchez.
Ferdinand of Castile (born 1238)
Ferdinand of Castile( 1238- before 1264/ 1269), Infante of Castile, was the son of King Ferdinand III of Castile and Joan of Danmartin.
He was the Count of Aumale, Baron of Montgomery and of Noyelles- sur- Mer.
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: Who is Sancho Iii Of Castile's paternal grandfather?