Girolamo Gianni was born in Naples in 1837. After a successful six month visit in 1866 to test the waters, Gianni settled in Malta with his family in July 1868. He became well-established in the production of a variety of scenes including harbour views, ships portraits, townscapes, landscapes and the uniformed depictions of troops from various parts of the British Empire in transit in Malta. He also recorded various scenes during the visit of the Prince of Wales to Malta on 6th April 1876.
Gianni remained in Malta until 1887 (or 8) when he returned to Naples. He continued to produce the occasional Maltese view after that date, no doubt from sketches previously assembled prior to his departure. He died at Torre del Greco in Naples towards the end of 1895. Gianni left behind him a devoted band of artist pupils or followers and his influence is easily detected in the works of Nicola Crescimanno (Crino), Luigi Maria Galea, Vincenzo D'Esposito, M. Gianni and Giovanna Manché.