Castile, Pedro Fernández de Velasco, Constable of Don; Haro, Pedro Fernández de Velasco, Count of Don
Fernandez de Velasco's daughter was abbess of the convent of Santa Clara, Medina de Pomar, near Burgos. He had begun construction of a chapel of the Immaculate Conception in the convent in 1460. His son finished paying for the chapel.
Ann Roberts. "The Master of the Legend of Saint Lucy: A Catalogue and Critical Essay." Ph.D. diss., (University of Pennsylvania, 1982): 92-95.
Hand, John O. and Martha Wolfe. Early Netherlandish Painting. (Washington, D.C., National Gallery of Art, 1986): 182 and n. 2.