Count Alessandro di Cagliostro (Italian: [alesˈsandro kaʎˈʎɔstro]; 2 June 1743 – 26 August 1795) was the alias of the occultist Giuseppe Balsamo ([dʒuˈzɛppe ˈbalsamo]; in French usually referred to as Joseph Balsamo).
Cagliostro was an Italian adventurer and self-styled magician. He became a glamorous figure associated with the royal courts of Europe where he pursued various occult arts, including psychic healing, alchemy and scrying. His reputation lingered for many decades after his death, but continued to deteriorate, as he came to be regarded as a charlatan and impostor, this view fortified by the savage attack of Thomas Carlyle (1795–1881) in 1833, who pronounced him the "Prince of Quacks". Later works—such as that of W.R.H. Trowbridge (1866-1938) in his Cagliostro: the Splendour and Misery of a Master of Magic (1910)—attempted a rehabilitation.
The history of Cagliostro is shrouded in rumour, propaganda, and mysticism. Some effort was expended to ascertain his true identity when he was arrested because of possible participation in the Affair of the Diamond Necklace.
Johann Wolfgang von Goethe relates in his Italian Journey that the identification of Cagliostro with Giuseppe Balsamo was ascertained by a lawyer from Palermo who, upon official request, had sent a dossier with copies of the pertinent documents to France. Goethe met the lawyer in April 1787 and saw the documents and Balsamo's pedigree: Balsamo's great-grandfather Matteo Martello had two daughters: Maria, who married Giuseppe Bracconeri; and Vincenza, who married Giuseppe Cagliostro. Maria and Giuseppe Bracconeri had three children: Matteo; Antonia; and Felicità, who married Pietro Balsamo (the son of a bookseller, Antonino Balsamo, who had declared bankruptcy before dying at age 44). The son of Felicità and Pietro Balsamo was Giuseppe, who was christened with the name of his great-uncle and eventually adopted his surname, too. Felicità Balsamo was still alive in Palermo at the time of Goethe's travels in Italy, and he visited her and her daughter.