Troya's intention to compile and summarize his previous writings related to Gothic architecture, which he has scattered throughout his works on Italian history and Lombard diplomatic codes. He begins by outlining the historical context of the Goths, discussing their migration patterns and cultural practices, notably their institutions and religious beliefs under figures such as Zamolxi and Deceneo. Through various historical examples, Troya sets the stage for analyzing Gothic architecture, emphasizing its distinction from both Roman and Germanic architectural forms, and hinting at how these discussions will inform a broader understanding of the period's architectural legacy. (This is an automatically generated summary.)