The present article reveals the study of the Antonio Palomino and Guillo’s wall paintings found in the Royal Parish of the Santos Juanes church in Valencia. The methodology followed combines bibliographic and technical-analytical studies allowing the symbiosis between the artists’ life and their work to be confirmed. The data collected in artistic and judicial literature serve as a stepping stone towards the technical studies of paintings. The detained study of the paintings from the different authors allowed ling the artistic grounds and the true reason for the destitution of the brothers from Castellon for the Giordano’s disciple to be determined and revealed.