In May 1158, Robertus was already Bishop-elect. Leone Mattei Cerasoli, "Di alcuni vescovi poco noti, (cont.)", in: Archivio storico per le province napoletane 44 (1919), p. 321.
Lancellotti belonged to the noble Roman family which had produced his brother, Cardinal Orazio Lancellotti (1611–1620). He was appointed Vice-Legate of Ravenna, and then of Bologna. Pope Paul V named him Bishop of Nola on 26 January 1615; he made his solemn entry into his diocese on Palm Sunday 1615. He redecorated the cathedral with statuary, a new pulpit, and two organs. He was appointed papal nuncio to Poland by Pope Paul V; he served from 1622 to 1627. At the conclusion of his term, he was recommended to Pope Urban VIII for a cardinalate, which never came. He died on 23 July 1656, at the age of eighty.Tadeusz Fidych, ed. (2001). Ioannes Baptista Lancellotti (1622–1627).: (22 XI 1622 – 31 XII 1623) in quo publicantur etiam documenta internuntii Antonii Francisci Cirioli (12 XI 1622 – 29 IV 1623). Acta Nuntiaturae Polonae, 22 (in Latin). Krakow: Academia Scientarium et Litterarum Polona. ISBN978-83-88857-05-8. Remondini III, pp. 291-363; Gauchat, Hierarchia catholica IV, p. 260.
Bishop Aurelius was present at the Roman synod of Pope Agatho in 680, whose decrees were sent in a synodal letter by Pope Agatho to the Council of Constantinople, which were subscribed by Bishop Aurelius. He states that he was part of the provincia Campaniae. J. D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus XI (Florence: A. Zatta 1765), p. 299.
"Bell" , Encyclopædia Britannica, 9th ed., vol. III, New York: Charles Scribner's Sons, 1878, pp. 536–537. The information is stated to be derived from Polydore Vergil (c. 1470–1555), hardly "traditionally credited", as claimed.
