Born in Rome, he gave his first concert in 1897, aged fifteen, and he went on to tour Europe to great acclaim.
Later settling in Brussels he established a tradition of Mandolin music in northern Europe.
He always played Mandolins produced by Luigi Embergher, which he compared to the Stradivarius violin in perfection.
Ranieri once visited Embergher's shop in Rome and tried out an instrument marked Gold Medal Paris 1900.
When he wanted to buy it the luthier replied that it was not for sale, but that he could play it at the evening recital.