This research is based on a catalogue of portals which have been built following the models printed in the Extraordinary book by Sebastiano Serlio and in other books of his treatise. The analysis of these often anonymous creations shows us how these models have been filtered by the expertise typical of the area where they’ve been built and its customs. We chose these models because, during the Renaissance, the treatise by Sebastiano Serlio, Bolognese architect and theorist, constitutes one of the most important editorial initiatives in matter of architecture. Thanks to his experiences in Bologna, his hometown, in Rome, in Venice and at the court of François I since 1541, Serlio gets skilled in composing ancient models and Italian Renaissance models with local traditions. In his Book IV, the author presents the five architectonic orders in a systematic and intelligible way : each drawing has a legend explaining measures and sizes, showing a balanced relation between text and image. The Extraordinary book, which was later added to Serlio’s program, is dedicated to portals. The decorative language of these imaginative inventions proves a bigger freedom in relation to Vitruvio’s rules. This work tries to illustrate certain migrations of Serlio’s prototypes through the study of portals built basing on his treatise. In order to analyze such assimilations, we propose a comparison of examples from France, Germany and Italy. To do such a thing, we have chosen three peripheral regions in each of these three countries, politically and economically independent from the central power of the sovereign’s court : Lorraine, in France, the area along the river Weser, in Germany, and Sicily, in Italy.