Orsini, son of Francesco Orsini, was a member of the aristocratic Roman family of the Orsini. He was a Doctor of Canon Law and a Protonotary Apostolic. On 4 July 1444 he was named Archbishop of Palermo, and then Archbishop of Taranto on 30 July 1445. He served as papal Nuncio in England. Jean Guiraud (1896). L'état pontifical après le grand schisme: étude de géographie politique (in French). Paris: A. Fontemoing. p. 116. Eubel, II, p. 136 with note 1; 211; 246.
Gennari was a native of Maratea (diocese of Policastro). He was the founder of the monthly journal Il Monitore ecclesiastico, and was a noted author of books on ecclesiastical topics. He was consecrated a bishop in Rome on 15 May 1881 by Cardinal Edward Howard. He was appointed Titular Archbishop of Naupactus on 6 February 1897, and was named a Cardinal by Pope Leo XIII on 15 April 1901. Gennari was a collaborator in the creation of the 1917 Pio-Benedictine Code of Canon Law. As a Cardinal, and particularly as Prefect of the SC of the Council, he pressed for frequent reception of communion. He died on 31 January 1914. Joseph Dougherty (2010). From Altar-Throne to Table: The Campaign for Frequent Holy Communion in the Catholic Church. Lanham MD USA: Scarecrow Press. pp. 82–83. ISBN978-0-8108-7092-5. Harris M. Lentz III (2001). Popes and Cardinals of the 20th Century: A Biographical Dictionary. Jefferson, NC USA: McFarland. p. 79. ISBN978-0-7864-4101-3. G. di Ruocco, Il Cardinale Casimiro Gennari. Pastore e giurista (1839–1914) (Naples: Laurentiana 1995).
Umberto Benigni. "Conversano." The Catholic Encyclopedia. Vol. 4. New York: Robert Appleton Company, 1908. Retrieved: 2016-10-02. Ughelli, VII, pp. 705-708. Kamp, pp. 628-629.
