Castilviejo created this mural oil painting with tempera finish on plaster on the wall of Banco Bilbao Vizcaya (presently BBVA) in Calle Duque de la Victoria in the city of Valladolid.
 
The work is divided in two stretches of wall forming a right angle, in one of the wings of the branch’s main office. The smaller section is on the left, measuring 1.07 m long, while the main section runs 15.33 m, interrupted by two wooden doors. The total painted surface covers 53.69 square metres.
 
The painting explores the spirit of Castile and its people, represented by large figures executed with sharp lines and an evident Italian influence, more specifically from Michelangelo (1475-1564), Andrea Mantegna (1431-1506) and Piero della Francesca (1415-1492), masters from whom Castilviejo borrowed stylistic references for this composition, incorporating cubist solutions in the construction of the planes of the various elements making up the mural painting.
 
In these paintings the artist combines traditional subject matters and a refined contemporary technique. With his lines and meticulous application of colour Castilviejo defines the foundations of the origin of the land he loved so much: its landscape stretching to infinity, the everyday life of its peoples, its folklore and the changing yellow of its rolling hills. A reality of understated colour, stripped of any anecdotal element.
 
The style of this painter from Zamora reminds us of the palette of Eduardo Rosales (1836-1873), the descriptive power and dramatic quality of Solana (1886-1945), the simplicity in resolving portraits shown by Zuloaga (1870-1945) and the technical expertise of Sorolla (1863-1923).
 
Castilviejo’s palette is made up of blacks, browns, pink earthy tones and sienna. He renounces the pure and shiny greens and blues that could have transformed the sorrowful elegy of Castile into a vital Mediterranean symphony, but his love for the Castilian essence foreclosed any such option.
 
This mural painting underwent significant restoration in 2006.