This note presents a study meant to set out a national catalogue(C.S.N.) of seismic events the epicentres of which are to be found inItalian territory (or nearby). The catalogue, that will start from theyear 1450 B.C., could be used for various purpose employing moderntechnologies.The complete C.S.N, is made of three main parts, each of which canalso have a separate life:1) An Analytical Catalogue which comprises the greater part ofdata and is the most complete;2) A Macroseismic Atlas that shows the macroseismic aspect ofthe most relevant events;3) A Macroseismic Catalogue that translates in numeric terms theAtlas. To these is added a comprehensive Bibliography subdivided into 24chapters each of which covers one of the 24 time periods into which thecatalogue has been subdivided.The... Analytical Catalogue besides giving the main parameters for eachearthquake (date, epicentre, hypocentral depth, MCS scale intensity, raagnitudo,each with its own reliability index) gives indications also on thefollowing sideline data:1) epicentral location (meaning by this the geographic region andthe eventual indication that the epicentre is to be found on a borderlinetouching more geographic regions, or in the sea, or on the coast, or othermisein the external band (see text);2) with a reference to the Atlas, the event is shown as having beendealt with also mocroseismic data and it will con be found, as such, inthe Atlas and in the Macroseismic Catalogue;3) indications on the typology of the earthquake: i.e. whether it is an« isolated » earthquake, or a « seismic period » (and if so with the indicationof the foreshock, main or aftershocks) or of a swarm;4) the possibility of indicating up to 7 sets of information suitablychose among 40 additional notes regarding instrumental, geophysical,physical or sensorial information besides the possibility of notifyingthat the event had undergone specific studies or whether it is even to beconsidered either noth sure or else legendary;5) the possibility of indicating up to four bibliographical items, is tobe considered as capital.The Macroseismic Atlas gives the isoseists of the more supported bydocumentary evidences earthquake, with the calculation of the relativeareas, of the rays of the equivalent circles and of the rays of prevalentmaximal and minimal propagation; these latter with the value of theazimuth measured from the geographical North passing through themacroseismic epicentre.The Macroseismic Catalogue reports numerically the macroseismic dataof the event: analytical and macroseismic epicentre; analytical and macroseismichypocentral depth, numerical values, in km., of the the threeserie of indicated rays, up to isoseist of the 4th degree (MCS).A fac-simile of working form is given.