Juan de Soria (died 1 October 1246), also known as Juan Díaz,Martín Alvira Cabrer, Las Navas de Tolosa, 1212: idea, liturgia y memoria de la batalla, Sílex, Madrid, 2012, pp. 40-41 ISBN 978-84-7737-721-4 Juan Domínguez de MedinaCatholic Hierarchy: "Bishop Juan Domínguez de Medina" retrieved January 16, 2016Juan Loperráez Corvalán, Descripción histórica del obispado de Osma, vol. I, pp. 229-235, uses Juan Domínguez. or Juan Ruiz de Medina,Gregorio de Argaiz: La Soledad laureada por San Benito y sus hijos en las iglesias de España, vol. VI, p. 357.Pedro Orcajo: Historia de la catedral de Burgos, part II, p. 10, uses Juan de Medina. was a Roman Catholic prelate who served as Bishop of Osma (1231–1240) and Bishop of Burgos (1240–1246) as well as in the chancery of King Ferdinand III of Castile (from 1211).GCatholic.org: "Metropolitan Archdiocese of Burgos" retrieved December 4, 2015
Biography Prior to becoming bishop, Juan served as abbot of Santander and Valladolid.Manuel de Castro Alonso: Episcopologio vallisoletano, pp. 60-72. In 1231, he was appointed by Pope Gregory IX as Bishop of Osma. On 29 May 1240, was he appointed by Pope Gregory IX as Bishop of Burgos where served until his death on 1 Oct 1246. While Bishop, he served as the principal consecrator of Lope Fitero, Bishop of Córdoba (1237), and Rodrigo Díaz, Bishop of Oviedo (1243).
Juan was probably the author of the Latin Chronicle of the Kings of Castile, written between 1217 and 1239.Derek W. Lomax, "The Authorship of the Chronique latine des rois de Castille", Bulletin of Hispanic Studies, XL (1963), 205–211.
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