In 1380 he signed the reliquary of the head of St. Petronius, commissioned by the Bolognese commune (now in the sacristy of S. Stefano), and in 1383 that of the head of St. Dominic, displayed in the church of the same name in Bologna. These are masterpieces of Emilian Gothic goldsmithing. The reliquary, structured on the model of a polygonal little temple open by biforas,
supported by a shaft set upon a high base, allowed R. to display extreme technical skill in enamels (whose figural compositions recall the painting of local 14th-century masters), cast statuettes, engraved, embossed, and pierced ornamental motifs in gilded silver, further enriched by corals. Praiseworthy are the sure technique and singular refinement of execution, less so the overabundance of very minute details that detract from a clear geometric line. Technical similarities, though employed with a more elegantly Gothic and less trite style, lead to the attribution to his school of a certain Jacopo di Michele, author of the fine reliquary of the finger of St. Thomas Aquinas in S. Domenico in Bologna.