Libro gótico de los testamentos

Pelagius (or Pelayo) of Oviedo (died 28 January 1153) was a medieval ecclesiastic, historian, and forger who served the Diocese of Oviedo as an auxiliary bishop from 1098 and as bishop from 1102 until his deposition in 1130 and again from 1142 to 1143. He was an active and independent-minded prelate, who zealously defended the privileges and prestige of his diocese. During his episcopal tenure he oversaw the most productive scriptorium in Spain, which produced the vast Corpus Pelagianum, to which Pelagius contributed his own Chronicon regum Legionensium ("chronicle of the Kings of León"). His work as a historian is generally reliable, but for the forged, interpolated, and otherwise skillfully altered documents that emanated from his office he has been called el Fabulador ("the Fabulist") and the "prince of falsifiers". It has been suggested that a monument be built in his honour in Oviedo.

The date and place of Pelagius' birth are unknown. The Liber testamentorum includes a genealogy that suggests that Pelagius may have been related to the western Asturian families that founded the monasteris of Coria and Lapedo. He also made a donation to his own canons of properties he owned in Villamoros and Trobajuelo, near León, suggesting perhaps a Leonese connexion.

The earliest known reference to Pelagius is as a deacon at Oviedo in 1096. He was an archdeacon there in 1097. His consecration as the auxiliary of bishop Martin I took place on 29 December 1098. He succeeded Martin four years later, as the choice of Alfonso VI, and with vigour took up the defence of his church's properties and jurisdictions. The Archbishop of Toledo (1086), Bernard de Sedirac, sought to incorporate the sees of Oviedo, León, and Palencia into his province as suffragans. In 1099 Pope Urban II gave the order. In 1104, Pelagius of Oviedo and Peter of León went to Rome to plead their case to the new pope, Paschal II, who granted them a privilege of exemption and made them dependent directly on Rome (1105). At the same time (1104), Pelagius engaged in lawsuits with the count Fernando Díaz, the countess Enderquina Muñoz, and the abbot of Corias to maintain his rights of seignory within Asturias. He was also involved in jurisdictional battles with the neighbouring sees of Burgos (over Asturias de Santillana) and Lugo, and between 1109 and 1113 had to fight off the metropolitan claims of the Archdiocese of Braga as well. In 1121 the Archdiocese of Toledo successfully petitioned Pope Callistus II to remove Paschal's 1105 exemption, though this was regained in 1122.

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