Sancho IV the Brave (1257 or 1258 – 25 April 1295, Toledo) was the king of Castile and León from 1284 to his death. He was the second son of Alfonso X and Yolanda, daughter of James I of Aragon.
Sancho IV (Sancho the Brave), 1257?-1295, Spanish king of Castile and León (1284–95), son and successor of Alfonso X. On the death (1275) of his elder brother, Ferdinand de la Cerda, Sancho was designated as Alfonso's successor by a coalition of nobles.
Sancho Alfonso of Castile (1342–1374), known in Spanish as Don Sancho Alfonso de Castilla, was Infante of Castile, 1st Count of Alburquerque. He was the ninth of the ten illegitimate children of Alfonso XI of Castile and Leonor de Guzmán . He was born in Seville.
Ferdinand was born in the city of Alcazar de San Juan on 6 December 1285 as the second child and eldest son of King Sancho IV of Castile and his wife María de Molina. He was baptized at Seville Cathedral by Archbishop Raimundo de Losana and was immediately proclaimed heir to the Crown and received the homage of the nobles of the kingdom.
Sancho IV, King of Castile and Leon, 1257-1295) found : Encic. univ. ilus. (Sancho IV, Rey de Castilla y de León, hijo de Alfonso X, b. 1257, d. 4/25/1295) Change Notes
Castile and León Monarch. Born the son of Sancho IV and Maria de Molina. His father had, with the support of the aristocracy, usurped the throne from his nephew, and contended with civil strife throughout his reign. According to records, he cemented his hold on power by executing 4,000 of his nephew's followers in Badajoz.
Crown of Sancho IV of Castile (1258-1295) 1 / 2 Crown found as his tomb in 1948 in the Cathedral of Toledo Vote 1 1 comment Best Add a Comment DonGatoCOL • 1 min. ago Made in silver, 8 pieces of it, adorned with 4 cameos (camafeos in Spanish) and 4 sapphires, and each plaque has a castle over it (symbol of the Kingdom of Castile).
Sancho was the eldest son of King Alfonso VII of León and Castile and Berengaria of Barcelona.  He was endowed with the "Kingdom of Nájera" in 1152, and according to Carolina Carl never appears in documents as "king of Nájera ". 
María de Molina was the wife of Sancho IV of Castile. She was queen consort of Castile and León from 1284 to 1295 and then regent until the coming of age of her son Ferdinand IV. María de Molina was an infanta (princess) from the Kingdom of León. She was the daughter of the infante Alfonso of Molina and Mayor Alonso de Meneses.
Sancho III the Great 1004–1035: 985 son of García Sánchez II and Jimena Fernández of Cea: Muniadona of Castile 1010 4 children: 18 October 1035 García Sánchez III 1035–1054: 1016 son of Sancho III the Great and Muniadona of Castile: Estefanía of Barcelona 1038 9 children: 15 September 1054 Atapuerca: Sancho IV Garcés 1054–1076: 1039