According to the newspaper The Daily Telegraph, the namesake of the collection and then the museum, the Roman Torlonia family, received ownership of the collection around 1800 or in the early 19th century. The previous owners, the Giustiniani family, had taken out a loan from the Torlonia dynasty and secured it with the collection, but then defaulted on paying back the loan.[2] (According to earlier information by the same newspaper, however, Prince Giovanni Torlonia himself was the founder of the collection when, in 1810, "he bought some works and unearthed others on his land in Portus".[3])
Alessandro Torlonia, heir to Giovanni, opened the collection to visitors in their family palace on Via della Lungara, close to the Tiber River, in 1893. In the 1960s, the museum was dismantled and the 77-room palace was illegally converted into a 93-unit apartment building.[3] The collection was put into storage and was not publicly displayed. In May 2005 the government attempted to buy the collection for 1.2 billion but the offer was declined.
The family put the sculptures into a trust in 2014. After an agreement was reached with the government in 2016, the site of the museum became a restoration and conservation center for the still private collection, but which the family now allows to tour nationally and internationally.[5]
Pietro Ercole Visconti: Catalogo del Museo Torlonia di Sculture Antiche. Roma 1876. 2.Edizione 1881 3.Edizione 1883 (Scanned text - the website archive.org) (in Italian)