The baronial palace of the Filangieri, which stands at the highest point of the historic center of Lapio, as it is today, is the expression of the period of greatest splendor of the noble family, reached during the seventeenth and eighteenth centuries. An illustrious family, whose origins date back to the time of the Normans, its representatives were the sons of Angerio the Norman - Filii Angerii and then Filangieri, who came to Italy during the eleventh century, following Robert I the Guiscard. From that time until the eighteenth century there were many important figures within the family. One of the prominent figures, is represented by Riccardo Filangieri, who followed the Emperor Frederick II of Swabia in the crusade of 1228 and deserved the appointment as Governor of Jerusalem. Since then the members of the family have been awarded the title of crusaders, so that its heraldic symbol becomes the cross, which is represented everywhere in the coats of arms and official documents. Of the relationship of closeness and sharing of ideas with the great emperor, we find expression in the aesthetic choices present inside the noble residence: the true of the octagonal well.

Other excellent figures of the family are represented by Hannibal Filangieri, who lived in the seventeenth century, in recognition of his merits by Emperor Ferdinand II of Austria, he was able to make a family coat of arms on which there was the biceps image of the imperial eagle and Agnello Filangieri, who lived in the eighteenth century, who enjoyed the esteem of Ferdinand IV of Bourbon, to be named by him, on 17 April 1766, "aio dell'infante di Spagna" don Filippo. And then we should not forget Gaetano Filangieri, flagship of the Neapolitan Enlightenment culture. As evidence of the socio-political growth of the family, the coats of arms are placed, among the first, in chronological order, there is the coat of arms carved on one of the eight stone slabs that constitute the true well of the court. Bipartite with cross on the right side (it is the blue cross in the field of silver of the Filangieri) and band scaccata on the left to witness the bond of kinship contracted with the Tomacelli family. Pompeo Filangieri, in fact, became lord of Lapio from 30 May 1601 and died on 7-3-1630, married at the beginning of the century Diana Capece Tomacelli.