Gius. di Gio. Battista Guidicini (1870). Cose notabili della Città di Bologna ossia Storia cronologica de'suoi stabili pubblici e privati (in Italian). Vol. I. Bologna: Tipogr. delle Scienze di Gius. Vitali. p. 200. P. Prodi, "The Application of the Tridentine Decrees: the Organization of the diocese of Bologna during the episcopate of Cardinal Gabriele Paleotti," in: E. Cochrane (ed.), The Late Italian Renaissance 1525–1630, (London: Palgrave Macmillan 1970), p. 232.
Rinovatione di alcuni ordini, altre volte pubblicati di commissione dell' illustrissimo et reverendissimo sig. Cardinale Ludovisio, arcivescovo di Bologna et principe, fatta nella sinodo dioecesana celebrata alli 11 di giugno MDCXX. In Bologna per Vittore Benacci 1620. Umberto Mazzone (2012). "Il Seicento nell'episcopato bolognese". Governare lo Stato e curare le anime (in Italian). libreriauniversitaria.it ed. pp. 148–149. ISBN978-88-6292-315-6.
Bishop Giovanni is first noted in a document of 997: Ludovico-Vittorio Savioli (1784). Annali Bolognesi (in Italian and Latin). Vol. I, Part. II. Bassano. p. 66. On 1 May 998 he attended the provincial synod of Archbishop Gerbert of Ravenna. Guidicini, p. 8, states that his name is found in the archives of the monastery of S. Stefano from 997 to 1012. Schwartz, p. 163.
Ludovico Ludovisi: Giovanni Fantuzzi (1786). Notizie degli scrittori bolognesi (in Italian). Vol. Tomo quinto. Bologna: Stamperia di S. Tommaso d'Aquino. pp. 78–81. Gauchat, p. 118, with note 5.
Guidi was born in Bologna in 1815. In 1834 he joined the Dominican Order at their convent in Viterbo, where he was given the degree of master of theology. He taught philosophy and theology in Viterbo and in Rome, at S. Maria sopra Minerva. He was twice elected Prior of the convent. In 1857 he was made professor of theology in Vienna. On 16 March 1863 he was named a cardinal by Pope Pius IX, with the titular church of San Sisto. On 21 December 1863 he was appointed Archbishop of Bologna. He resigned on 12 November 1871, in the light of the annexation of the Papal States and Rome by the Kingdom of Italy. He was appointed Bishop of Frascati in 1872, and Prefect of the Congregation of Ecclesiastical Immunity in Rome. He died on 27 February 1879. Ritzler-Sefrin, Hierarchia catholica VIII, pp. 45, 153. Martin Bräuer (2014). Handbuch der Kardinäle: 1846-2012 (in German). Berlin: De Gruyter. pp. 74–75. ISBN978-3-11-026947-5.
Svampa was born in Montegranaro in 1851. He was given degrees in theology and Civil and Canon Law by the Athenaeum S. Apollinare in 1879. He had been Bishop of Forlì from 1887 to 1894. He was named a cardinal on 18 May 1894, and appointed Archbishop of Bologna on 21 May 1894. He died in Bologna on 10 August 1907. Bräuer, p. 170. Harris M. Lentz III (2015). Popes and Cardinals of the 20th Century: A Biographical Dictionary. McFarland. p. 183. ISBN978-1-4766-2155-5.
Antonio Scottà (2002). "Parte seconda". Giacomo Della Chiesa arcivescovo di Bologna, 1908-1914: l'"ottimo noviziato" episcopale di papa Benedetto XV. Saggi e ricerche // Istituto per la Storia della Chiesa di Bologna, 14. Soveria Mannelli: Rubbettino Editore. ISBN978-88-498-0459-1.
