In 1388, the Giudice Eleonora d’Arborea chose Gonnostramatza as the location for the signing of the peace treaty with Pietro IV of Aragon. Until the 17th century, Gonnostramatza was the most populated and important town in Marmilla, nestled in a valley brimming with vineyards, olive groves and almond trees, crossed by the river Mannu that divides it into two districts, ‘big’ and ‘small’, with three bridges to ensure transition from one to another. The historic centre preserves ancient houses with typical Campidanese architecture. One highlight is the parish church of San Michele, famous for its aps that houses the Retablo dell’Annunziata by Lorenzo Cavaro from 1501, progenitor of the family of painters from Cagliari who gave life to the school of Stampace (16th century). The large altar table, coming from the Chiesa di San Paolo in the hamlet of Serzela (today a ghost town), consists of three vertical and two horizontal upper components, each divided into various sectors. Scenes from the life of Christ, of the Madonna, archangels and saints are represented.