Il disegno dei baluardi cinquecenteschi nell’opera dei fratelli Palearo Fratino. La piazzaforte di Alghero.

The research analyzes the design of the bulwarks in the work of the Palearo Fratino brothers, military engineers in the service of Spain in the second half of the sixteenth century and is structured in three main phases: the first, studies the design of the sixteenth century fortifications, the second examines the work of Jacopo and Giorgio Palearo in the Mediterranean area and especially in Sardinia from 1563 to 1578, while the third proposed (through the use of results of the first two phases and the support of post-medieval archaeological research) digital models of projects and of the existing structures in the stronghold of Alghero. The method of research adopted find in the graphical analysis a tool able to support historical and archaeological investigation. The study of the military treatise is focused in particular to “Della fortificatione delle città” of Maggi and Castriotto, painted in the 1564, and cited by Jacopo Palearo as a reference text in the design of the bulwarks of Cagliari. Projects analysis and survey of some sections of representative works, has identified a repertoire that highlighted the use of Maggi and Castriotto’s treaty to confirm what El fratin said and reported in the historical documents. The results finally obtained through the research allows a better understanding of the design of military engineers and of the project activity of the Palearo Fratino brothers, that use particular attention to acompagnar las obras con la naturaleza del sitio.