Beryllus is known from the Martyrologium Romanum, a liturgical calendar used by the diocese of Rome. Ottavio Gaetani (1657). Petrus Salernus (ed.). Vitae sanctorum Siculorum, ex antiquis graecis latinisque monumentis (in Latin). Vol. I. Palermo: apud Cirillos. pp. 18–19. Pirro, pp. 514–515 (who lists numbers of authorities, beginning with Cardinal Baronius, who followed that source). The accumulation of followers does not increase the authority of the source.
Alessandro Musco; Giuliana Musotto (2007). I francescani e la politica. Franciscana, 13 (in Italian). Vol. 2. Palermo: Officina di Studi Medievali. pp. 190, with note 69. ISBN978-88-88615-63-9. J.H. Sbaralea (ed.), Bullarium Franciscanum III (Rome 1765), p. 214, no. XLI.
Branciforte was born in Palermo, the son of Ercole, 1st Duke of San Giovanni. In 1627 he was appointed to the Royal Council of Sicily by King Philip IV of Spain, and was named a royal Chaplain. He was Bishop of Cefalù from 1633 to 1638. Francesco Maria Emanuele e Gaetani Villabianca (marchese di) (1757). Della Sicilia nobile. Vol. Parte seconda, continuazione. Palermo: nella stamperia de' Santi Apostoli. pp. 19–20. Pirro, pp. 560–561. Gauchat, pp. 142, 146.
Umberto Benigni (1908), "Catania (Catanensis)"The Catholic Encyclopedia Vol. 3. New York: Robert Appleton Company, 1908, retrieved: 2017-3-30, states that the date was 1860, but the other sources (e.g. Cheney and Chow) unanimously say that the date was 1859.
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Boccamazza was the brother of Cardinal Giovanni Boccamazza, who was Archbishop of Monreale in Sicily. Angelo probably (according to Walter) abandoned his diocese as a result of the Sicilian Vespers of 1282, and thereafter lived in Rome. He continued to hold the title of Bishop of Catania until 1296. Pirro, p. 536. Ingeborg Walter, "Boccamazza, Angelo,"Dizionario biografico degli Italiani Volume 11 (1969).
