[3] Montegioco borders the following municipalities: Avolasca, Cerreto Grue, Costa Vescovato, Monleale, Montemarzino, and Sarezzano.

The small community, upon payment of a substantial sum to the Ducal Chamber, avoided being enfeoffed in 1647 to Nicolò Busseti, but later renounced its autonomy and was enfeoffed to the brothers Biagio Gaetano and Carlo Alessandro, raising it to a marquisate from 22 September 1689 to which the lordship of Casasco was added (1698), then with the title of marquisate in 1773, Cerreto Grue (1693), Corneliasca (1698), Montebore, Oliva, Rocca del Grue, Montebello, Berzano di Tortona (1733).

In the locality of Palazzo, in the first half of the XVII century, a noble residence was built by the Busseti family of Tortona, equipped with extensive rustic buildings and a mill.

Today, the palace has been renovated in the 20th century with the features of a castle surmounted by a crenellated tower and with the corners of the building adorned with bertesche, recently restored.

Allodial property of the Busseti family, it passed into the hands of Emilio Signoris-Busseti (nominated in 1810 by Emperor Napoleon I as Baron of Montegioco), while after 1817, the year of his death, it remained in the hands of his widow Sofia Valesa and her daughter Eugenia Signoris married to Guasco di Bisio, who in 1881 sold it to Countess Luigia Veglio di Castelletto.