The Parametric Catalogue of Italian Earthquakes (CPTI15), includes almost 5000 events; among them there are about two hundred earthquakes scarcely studied, belonging to the AMGNDT995 database, whose parametrization remains very uncertain. Five of these earthquakes are revised in this paper, with the aim of appraising their knowledge and enriching them with better information and data. In addition, we present here an event not listed in the Italian seismic catalogues that occurred in the Colli Albani volcanic district, near Rome, in 1981.