The first attestation of the toponym "Lucardo" dates back to the Early Middle Ages (to be precise, to the year 767), linking this place in some way to the city of Pistoia. The document providing attestation was the private act by means of which one of the most important figures of Longobard lineage, the medicus regio Gaiduald, endowed the suburban monastery of San Bartolomeo. Among the assets donated, the "curtem in Lucardo" is mentioned, with all its appurtenances, meaning houses, vineyards, lands, meadows, pastures, woods, etc. The reference made is the mention of a substantial core of land and other real estate that were to be the point of reference for the farm headquarters, the so-called curtis, namely, a physical place called "Lucardo". It is very likely that the lands of Lucardo belonged originally to the royal fiscal system, as evidenced by two maps of the year 998 that mention this location. The first document mentions Lucardo among the properties donated by the Marquis Bonifacio to the powerful imperial abbey of Marturi, and subsequently confirmed by the owners of the March of Tuscany. The second document, again from the year 998, confirms the special nature of these lands and the link that they subsequently had with one of the most important noble families in Tuscany, that of the Cadolingi: being, in fact, the imperial diploma by means of which Otto III placed the church of San Salvatore a Settimo—along with the churches of San Martino alla Palma and San Donato a Lucardo—under the direct protection of the Empire. At that time the emperor was in the city of Pistoia, the city of which, right at the end of the 10th century, the Cadolingi lineage—future patrons of the monastery of Settimo—boasted the title count. If the close connection between the Counts of Fucecchio and the lands of Lucardo is thus demonstrated, the following documentation shows the existence of other personages and bodies holding rights in this territory, and on what, at least since the mid-11th century, has been called "castle" of Lucardo.