The founding of the Hieronymite monastery of Guijosa Historical milestone · Espeja de San Marcelino, Tierras del Burgo, Soria Image of Espeja de San Marcelino, not of the place itself. The cardinal and bishop of Osma Pedro Fernández de Frías founded in 1402 this monastery of Saint Jerome. In 1525 it passed to the patronage of the Avellaneda and after the disentailment it declined until it was demolished in the twentieth century. 1402 Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Espeja de San Marcelino