[1] He trained in Palermo initially with Antonio Manno and Francesco Sozzi,[2] but at the age of twenty moved to Rome to work under Giovanni Battista Wicar.
He married Anna, the daughter of the painter Giuseppe Velasquez in Palermo.
In 1828, he replaced his father in law as professor at the Regia Accademia del Nudo in Palermo.
Riolo died during the Cholera epidemic of 1837, and was replaced as professor by another pupil of Velasco, Salvatore Lo Forte.
Among other works, he painted frescoes in the Palazzo Tasca and Gangi, in the Real Casino (Villa) della Favorita, the church of Sant'Ignazio all'Olivella, and the Royal Palace (Reggia) of Ficuzza.