His play Rambaldo di Vaqueiras (1921) ('poema drammatico cavalleresco', or 'a chivalric dramatic poem') is a fanciful take on the titular troubadour poet, who falls in love with his patron's daughter Beatrice. It is said to owe much to Edmond Rostand's work, in particular his Rudel play, La Princesse Lointaine (of which plenty elsewhere on this blog) - for example, Berrini's Rambaldo is mortally wounded and dies in Beatrice's arms. If your Italian is up to it, you can compare and contrast at the Internet Archive, which has the full text of Rambaldo di Vaqueiras.
Berrini's obscurity these days may simply be down to the mediocrity of his work or to the whims of posterity; but it might have been assisted by the story of an incident during World War Two that, if true (or even if not), can't have done much for his reputation. While living in the Piedmont town of Boves, Berrini became caught up in an operation by the German SS to burn the town to the ground. A terrified Berrini scoured his library for a German newspaper cutting that quoted Hitler's appreciation of the writer's work, and took the article to show to the SS commander. Berrini's house was saved, but the other townfolk never forgave him. That, at least, is the story told on Berrini's Italian wikipedia page.
