Isabella of Navarre, Viscountess of Rohan
Isabel d' Albret of Navarre( 1512–1555) was the daughter of John III of Navarre( died 1516) and Catherine I of Navarre, sister and heiress of Francis Phoebus, King of Navarre.
As heir apparent, her brother rose to the throne in 1517 as Henry II of Navarre, grandfather of King Henry III of Navarre( Henry IV of France).
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.
Joan of Navarre (regent)
Joan of Navarre( 1382 – July 1413) was the heir presumptive to the throne of Navarre in 1402 – 1413, and regent of Navarre in the absence of her father in 1409 – 1411.
She was the eldest child of King Charles III of Navarre by his wife Eleanor, daughter of King Henry II of Castile.
Blanche of Navarre, Duchess of Brittany
Blanche of Navarre( 1226 – 12 August 1283), also known as Blanche of Champagne, was the daughter of Theobald the Troubador, King of Navarre and Count of Champagne, and his second wife Agnes of Beaujeu.
She was a member of the House of Champagne.
By her marriage to John I, Duke of Brittany, she became Duchess consort of Brittany.
Blanche of Navarre, Countess of Champagne
Blanche of Navarre( ?–1229) was countess and then regent of Champagne and finally also regent of her native kingdom of Navarre.
She was the youngest daughter of Sancho VI of Navarre and Sancha of Castile, who died in 1179, about two years after Blanche's birth.
Her eldest brother, Sancho VII of Navarre, succeeded their father as King of Navarre and was the last male descendant of the first dynasty of Kings of Navarre, the Pamplona dynasty, dying childless.
Her elder sister Berengaria of Navarre married Richard I of England.
René I, Viscount of Rohan
René I de Rohan,( 1516–1552) 18th Viscount of Rohan, Viscount and Prince de Léon, and Marquis de Blain married Isabella of Navarre daughter of jure uxoris King John III of Navarre and Catherine of Navarre, Queen of Navarre.
Blanca of Navarre, Queen of Castile
Blanca of Navarre (
aft.
1133, Laguardia, Álava – August 12, 1156) was Queen of Castile, the daughter of King García Ramírez of Navarre and his first wife Margaret of L'Aigle.
Blanca married Sancho III of Castile, regent of Castile (subject to his father Alfonso VII) on February 4, 1151 in Carrión de los Condes, Palencia, after travelling from Calahorra, Logroño, in January.
The marriage was arranged to insure closer ties between León-Castile and Navarre.
As was traditional, Blanca confirmed documents with her husband, so her activity may be traced until 1155.
On November 11, 1155 she gave birth to the future king Alfonso VIII.
There appears to be no record of her activities after December 1155, and she died on August 12, 1156.
The cause of her death seems to have been complications of a new pregnancy, a child named García.
In addition, she had other children buried in the church of San Pedro in Soria, although they are not identified.
That her death was caused by a pregnancy is recorded in an epitaph engraved on her tomb, however, the engraving did not survive a sixteenth-century reconstruction of the royal tombs in Nájera.
Her sarcophagus lid was preserved, and it represents the queen's deathbed with members of the court, including her husband, mourning her passing.
Blanca was buried in the pantheon of the Navarrese kings in the monastery called Santa María la Real of Nájera, to which Sancho made donations on her behalf.
The sarcophagus of the queen is regarded as a primary example of the ability to express human emotions in visual images in the 12th century.
Blanca and Sancho had two named sons:
Blanche II of Navarre
Blanche II( 9 June 1424 – 2 December 1464), titular queen of Navarre, was the daughter of John II of Aragon and Blanche I of Navarre.
She was also Princess of Asturias by marriage.
Charles, Prince of Viana
Charles, Prince of Viana( 29 May 1421 – 23 September 1461), sometimes called Charles IV of Navarre, was the son of King John II of Aragon and Queen Blanche I of Navarre.
Beatrice of Navarre, Countess of La Marche
Beatrice of Navarre( 1392-1412/1415) was a daughter of Charles III of Navarre and his wife, Eleanor of Castile.

Question: Where was the husband of Blanca Of Navarre, Queen Of Castile born?
Answer: Toledo