20th Century Spanish
 
In 1942 Castilviejo began training at the San Fernando School of Fine Arts in Madrid, where he studied under, among other teachers, Joaquín Valverde (1896—1982), a master in the use of colour from whom Castilviejo learned “to feel painting.”
 
When his father died in 1946 Castilviejo was forced to work to sustain his family, creating film posters and covers for cowboy novels, a genre very much in fashion at the time, as well as bullfighting drawings, an art he learned to love from his father. The expertise and practice attained in these assignments would contribute later to his successful achievements as a mural painter.
 
After completing his military service in Valladolid, he returned to Zamora (1947) where he co-founded, together with the painter Daniel Bedate (1905—1975), the San Ildefonso School, which at one stage was home to more than three hundred students. Meanwhile he survived thanks to the patronage of the bullfighting impresario Pepe Dominguín (1922—2003), who looked for clients for his paintings with bullfighting subject matters among breeders and other people involved in that world. In the 1950s he created, among other works, murals for the Universidad Laboral church in Zamora (1955).
 
In 1959, three years after marrying Julia Carretero, he moved to Valladolid, and then in 1969 he settled in Cubillas de Santa Marta, a small village in the province.
It was in Valladolid where he forged his own style and began to gain commissions, thanks to the support of friends such as Mariano Vaquero and José Mosquera (Chairman of the Chamber of Commerce). In those years he created his most accomplished mural: the work he painted for the BBV headquarters (currently BBVA) in Calle Duque de la Victoria.
 
In 2002 he won a Gold Medal in Fine Arts from the regional government of Castile and Leon, in recognition of his artistic work.