Quirós was a native of Spain. He had been Bishop of Castellamare di Stabia (1601–1604). He was nominated Bishop of Pozzuoli by the King of Spain, and preconised (approved) by Pope Clement VIII on 18 August 1604. He died in Rome of disease in Ughelli, p. 285 (who states that he died in 1615). Cappelletti, p. 666 (who states that he died in 1616). Gams, p. 915 column 1. Gauchat, pp. 140 with note 2; 289. Vidal Guitarte Izquierdo (1994). Episcopologio español (1500-1699): españoles obispos en España, América, Filipinas y otros países (in Spanish). Roma: Instituto Español de Historia Eclesiástico. pp. 116, no. 733. ISBN9788470094187.
Bishop Gaudiosus was present at the Roman synod of Pope Agatho in 680, and subscribed the synodical letter which was sent by Pope Agatho to the Council of Constantinople. J. D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XI (Florence: A. Zatta 1765), p. 299. Cappelletti, p. 652. Ughelli, p. 275 is wrong in having Bishop Gaudiosus actually attend the Council of Constantinople.
Bishop M. was present at the consecration of the church of S. Gregorio in Naples, and in 1193 he signed the bull which sanctified John Gualbert. Ughelli, p. 278. Cappelletti, p. 658. The date is 1 October 1193, despite older reports of the bull as belonging to 1194: Antonella Degl'Innocenti (2001), "Giovanni Gualberto," in: Dizionario Biografico degli Italiani Volume 56 (Treccani 2001).
