Preradovic´, Dubraka (2021). "Donato di Zara, Teodosio di Oria ele traslazioni delle reliquie nelle città bizantine dell'Adriaticonel IX secolo". Bisanzio sulle due sponde del Canale d'Otranto. Spoleto: Fondazione Centro italiano di studi sull'alto Medioevo. pp. 100–105. ISBN978-88-6809-355-6. Retrieved 20 January 2024.
Guerrieri, p. 103. Guerrieri claims that Archbishop Guilelmus was present at the Council of Guastalla in October 1106. Compare: Uta-Renate Blumenthal (1978). The Early Councils of Pope Paschal II, 1100-1110. Toronto: Pontifical Institute of Mediaeval Studies. p. 42. ISBN978-0-88844-043-3., who points out the extreme paucity of evidence as to those in attendance, and mentions no one from the Kingdom of Naples. Guerrieri was misled by the document, the famous cassatio which was actually signed by Archbishop Guilelmus on 23 April 1112 at Lateran council of Paschal II: J.D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XX (Venice: A. Zatta 1775), p. 1212 (which is misplaced).
Archbishop(-elect) Bajalardus of Brindisi was present at the consecration of Pope Gelasius II on Sunday 10 March 1118 at Gaeta. His consecration and pallium had to wait, since the Pope fled to Pisa and then to France, where he died. Bajalardus was finally consecrated in February 1122 by Pope Calixtus II, who also made him a Cardinal Deacon of the Roman church. He took part in the transfer of the remains of S. Peregrinus at Trani in 1143. Pandulfus Pisanus, "Vita Gelasii II", in: L. A. Muratori, ed. (1723). Rerum Italicarum scriptores (in Latin). Vol. Tomus tertius. Mediolani: ex typographia societatis palatinae. p. 389. Ughelli, pp. 32-33. Guerrieri, pp. 103-104. Klaus Ganzer, Die Entwicklung des auswärtigen Kardinalats im hohen Mittelalter (Tübingen: Max Niemeyer 1963) pp. 74-75. Rudolf Hüls, Kardinäle, Klerus, und Kirchen Roms, 1049–1130 (Tübingen: Max Niemeyer 1963), p. 245.
J. D. Mansi, L. Petit, J.B. Martin (edd.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XXXVIter (Arnhem-Leipzig: Hubert Welter 1924), pp. 41, 49.
A bishop Marcus of Calabria of the Province of Calabria was present at the Council of Nicaea in 325, the only bishop from Italy at the assembly. That he was from Brindisi is only a supposition. J.D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus II (Florence: A. Zatta 1769), p. 696. Lanzoni, p. 309.
Guerrieri, p. 103. Guerrieri claims that Archbishop Guilelmus was present at the Council of Guastalla in October 1106. Compare: Uta-Renate Blumenthal (1978). The Early Councils of Pope Paschal II, 1100-1110. Toronto: Pontifical Institute of Mediaeval Studies. p. 42. ISBN978-0-88844-043-3., who points out the extreme paucity of evidence as to those in attendance, and mentions no one from the Kingdom of Naples. Guerrieri was misled by the document, the famous cassatio which was actually signed by Archbishop Guilelmus on 23 April 1112 at Lateran council of Paschal II: J.D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XX (Venice: A. Zatta 1775), p. 1212 (which is misplaced).
Bishop Guilelmus was the author of a life of St. Leucius. He took part in the Third Lateran Council of Pope Alexander III in March 1179. J.D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XXII (Venice: A. Zatta 1778), p. 461. Ughelli, p. 33. Guerrieri, p. 104.
Maddalena restored the cathedral after it had been damaged by the earthquake of 1743. Umberto Benigni. "Brindisi." The Catholic Encyclopedia. Vol. 2. New York: Robert Appleton Company, 1907. Retrieved: 2016-10-17.
