Ignatio Fiorillo was an Italian composer. He is known as an author of opera seria, often composed to the libretti of Pietro Metastasio. His musical education was supported by Count Ferdinand Otto von Traun, who allowed him to study at the Naples Conservatory, as a pupil of Leonardo Leo and Francesco Durante. His career began with opera L'egeste, premiered in Trieste in 1733. Another opera, Il vincitor di se stesso, was performed in 1741 in Venice, and Fiorillo introduced himself as an opera composer also in Milan and Padua. In the middle of the 1740s he made several European tours as a member of the ensemble of Phillip Nicolini, specialised in children mime (Teatro dell'Opera Pantomima dei Piccolo Hollandesi di Nicolini). Fiorillo was engaged as a composer for their performances. In 1749 he resided with Nicolini in Braunschweig, at the court of Carl I. von Braunschweig-Wolfenbüttel. Fiorillo was appointed court composer in 1750, and Nicolini became the director of court theatres. In 1762, Fiorillo was engaged by Frederick II, Landgrave of Hesse-Cassel at his court in Kassel. He significantly improved the quality of the court opera in Kassel. Ingazio Fiorillo retired in 1779, and died in Fritzlar, Germany. He was the father of Federigo Fiorillo (1753 - 1823) a violinist and composer, best known for a collection of etudes.