The book provides an updated reading on the fortification of the city of Bosa, and the castle church, the Palatine chapel of the judges of Arborea, from an architectural and artistic perspective. Particular attention and emphasis have been placed on the presence inside the sacred building of a cycle almost entirely preserved, a unique example in Sardinia, of fourteenth century frescoes on the themes of Franciscan spirituality.

The book provides a detailed description of the architectural structure and the different phases of construction of the monastic complex. Particular attention is devoted to the pictorial cycle, to the architectural sculptures of the porch, and of those randomly placed inside the church, especially to the binate capitals from the cloister. Finally, a stylistic and iconographic reading of the Retablos, formerly belonging to the Basilica, and now preserved at CE. DO. C. Of Codrongianos, compl...