At the beginning of the 13th century, the castle of Tonda was in the hands of people of the Pisan nobility belonging to the consortium of the Pannocchieschi d'Elci, although some documents inform us that the ancient lord, the bishop of Volterra, still owned several houses and land, both in the castle and in the curtis of Tonda. In these same years, however, the young municipality of San Miniato, in strong ascent, extended its territory of influence as far as to include large areas of the Val d'Egola. In 1230 the lords of Tonda ceded their share of the castle to San Miniato. At the same time the castle community spontaneously made act of submission to the San Miniato authorities. The territorial policy of the fortified castle of Frederick I was centered on maintaining the network of pre-existing castles, whose structure it did not modify, but which it used for surveillance of the countryside. Basically, San Miniato had a tendency of using the governmental structures that already worked within the castle communities. In some cases, as documented for the castle of Tonda, it maintained the same notable local figures who were already engaged in government of the community. This was the case for the castellan of Tonda, a representative of the family of the last lords of the area, who was in charge of the jurisdictional function of the castle community on behalf of the municipality of San Miniato. The history of this small castle, therefore, follows, throughout the 13th century, that of the fortified castle of Frederick I, with an "urban" vocation. However, during the 14th century, the military action of Florence took shape, which by its acquisition of the territory of San Miniato, showed intention to control the important network of commercial routes passing at the base of the hill of San Miniato. The castle of Tonda, together with the castles of Montaione, Collegalli, Barbialla, and Santo Stefano, was acquired by Florence in 1370. From an administrative point of view, Tonda became part of the Montaione podesteria.