The opportunity to describe and analize the architectural history of this big renaissance monument (attributed to Francesco di Giorgio Martini, 1484) has given the chanche to the author to recostruct the whole urban shape of the city of Ancona, from the greek period up to the XVI century, with the modifications of his military walls and urban development of the old central area and harbour. This book is supplied with a folder containing enclosed several architectural drawings of the Palazzo del Governo in grand size.