The Deverry Cycle is a series of Celtic fantasy novels by Katharine Kerr set in the fictional land of Deverry.
 As of November 2009, fifteen books have been published in the series.
Carlo Emilio Bonferroni (28 January 1892 – 18 August 1960) was an Italian mathematician who worked on probability theory.
 Carlo Emilio Bonferroni was born in Bergamo on 28 January 1892 and died on 18 August 1960 in Florence.
 He studied in Turin, held a post as assistant professor at the Turin Polytechnic, and in 1923 took up the chair of financial mathematics at the Economics Institute in Bari.
 In 1933 he transferred to Florence where he held his chair until his death.
That Awful Mess on Via Merulana is an Italian novel by Carlo Emilio Gadda, first published in Italy by Garzanti Editore s.p.a. in 1957.
 An English translation by William Weaver was published in 1965.
Katharine Kerr (born 1944) is an American science fiction and fantasy novelist, best known for her series of Celtic-influenced high fantasy novels set in the fictional land of Deverry.
Emilio Luigi Carlo Giuseppe Maria Ghione (July 30, 1879 – January 7, 1930), known as Emilio Ghione, was an Italian silent film actor, director and screenwriter.
 Ghione was best known for writing, directing and starring in the Za La Mort series of adventure films, in which Ghione played a likeable French Apache and 'honest outlaw.'
 Ghione directed, wrote and acted in every genre of film, and directed some of the most famous stars of the time, including Francesca Bertini, Lina Cavalieri, Alberto Collo and Hesperia.
 After his final film role in 1926, Ghione briefly performed on a theatrical tour of Italy.
 Ghione wrote three novels based around his Za La Mort character, an autobiography, and an essay on Italian Silent Cinema, before his death from tuberculosis in 1930.
This article lists some of the major characters in the Deverry Cycle by Katharine Kerr.
Daggerspell (1986) is a fantasy novel by American writer Katharine Kerr.
 Her first novel, it is also the first book in the Celtic themed, multi-reincarnational "Deverry cycle".
Un maledetto imbroglio also known as "The Facts of Murder" is a 1959 Italian crime film mystery directed by and starring Pietro Germi with Claudia Cardinale.
 The film is based on the novel by Carlo Emilio Gadda "Quer pasticciaccio brutto de via Merulana".
 The film was restored and re-released in 1999 both in Italy and the USA.
Eros e Priapo: da furore a cenere is a 1945 satiric pamphlet by Italian author Carlo Emilio Gadda.
Carlo Emilio Gadda (] ; November 14, 1893 – May 21, 1973) was an Italian writer and poet.
 He belongs to the tradition of the language innovators, writers that played with the somewhat stiff standard pre-war Italian language, and added elements of dialects, technical jargon and wordplay.

Question: Carlo Emilio Gadda and Katharine Kerr both were considered what?
Answer: writers