Located in via Parenti 22 and built in travertine, it dates from the 13th century in a style that is a transition between Romanesque and Gothic. On one of the pointed arches of the ground floor it’s possible to see a lily. The Grosso, coined in this place, has on one side a cross with two “M” at two corners and the words “De Massa” and on the other side the figure of Saint Cerbone with words “San Cerbon”. After the fall of the Republic of Massa, the palace passed to the Counts of Sassetta and subsequently to the Bishops for the extension of their residence. Today the building houses the Società dei Terzieri Massetani.