Rosario Gagliardi was born around 1690 in Syracuse to Onofrio Domenico, a Calabrian carpenter who had settled in Syracuse, and Maria Conti.
The family lived in Syracuse in a district called “degli Bottagherelli” until 1707, when their father moved to Noto for work. It was in this town that Gagliardi officially began his work as an architect.
The commitment and skills shown in the town’s reconstruction made him one of the best architects in Sicily. He was called to Ragusa, Caltagirone, Syracuse and Niscemi, and was responsible for most of the religious buildings in the Val di Noto.