

http://es.wikipedia.org/wiki/Diego_La%C3%ADnez
If it is accepted that he [Diego Laínez de Vivar (ca. 1023-1058)] was El Cid's father, he was married to María, Sancha or Teresa Rodríguez (only the surname of El Cid's mother is known for sure), who was the daughter of the Count of Oviedo, Rodrigo Álvarez who ruled several estates, including Luna, Torremormojón, Moradillo, Cellorigo and Curiel.3
https://es.wikipedia.org/wiki/Diego_Fla%C3%ADnez
a. Others think that he was a member of the highest nobility given his marriage to a daughter of Count Rodrigo Álvarez.3
< Medlands >
https://thesignsofthetimes.com.au/34/70015.htm
The Historia Roderici names Diego Laínez as son of “Laín Nuñez”. The "Corónicas" Navarras name "Iac Layniç" as the son of "Layn Nuniç". The Nobiliario of Pedro Conde de Barcelos names "D. Diego Lainez, D. Fernando Lainez" as the children of "Lain Nuñez".
“...Didaco Flaginiz” subcribed the charter dated 29 Oct 1047 under which [presumed to be his wife´s uncle] “Nunu Albariz et uxor mea domna Goto” donated the church of Santa María “in riuulo Kabie iuxta terminos de...Burgos” to San Pedro de Cardeña. He captured the castles of Ubierna, Urbel and La Piedra from Navarre, probably after 1054. 1
Diego married doña Teresa Rodríguez DE ASTURIAS, daughter of Rodrigo Álvarez DE ASTURIAS and Teresa LAÍNEZ.
http://es.wikipedia.org/wiki/Diego_La%C3%ADnez
María, Sancha o Teresa Rodríguez (solo se conoce con seguridad el apellido de la madre del Cid), que era hija del conde de Oviedo Rodrigo Álvarez de Amaya y nacida de una hija ilegítima del Rey de León.
1023 |
1023
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León, Leon, Castilla-Leon, Spain
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1043 |
1043
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Vivar del Cid, Burgos, Castile and León, Spain
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1058 |
1058
Age 35
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Vivar, Burgos, Castilla, Spain
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???? |