Giuseppe Filippo Liberati Marchi (1735 – 2 April 1808) was an Italian-English painter and engraver.
Giuseppe Filippo Liberati Marchi was born in the Trastevere quarter of Rome.
He studied in the St. Martin's Lane Academy, and became Reynolds's most trusted assistant, being employed to set his palette, paint his draperies, make copies, and pose for pictures, among other tasks.
[1] The first picture painted by Reynolds when he settled in London was a portrait of young Marchi in a turban, which was much admired at the time, and engraved by J. Spilsbury in 1761; it is now the property of the Royal Academy.
Known as a copyist, but unsuccessful in original portraiture, he tried at one time to establish himself at Swansea, but soon returned to the service of Sir Joshua, with whom he remained until the painter's death.