How did studying ancient Roman monuments influence Donato Bramante’s architecture?

Donato Bramante’s study of ancient Roman monuments was fundamental to his development as the creator of High Renaissance architecture. After moving to Rome in 1499, Bramante devoted himself to examining ruins and ancient structures, which profoundly shifted his style from his earlier Lombard work toward a mature, "grand" manner.12

His engagement with antiquity influenced his architecture in several key ways:

• Adherence to Classical Idioms: Bramante became the primary interpreter of Pope Julius II’s vision to recreate the ancient empire of the Caesars (renovatio imperii). His designs, such as the Belvedere court, utilized classical models like the Colosseum’s elevation and imperial palace layouts.12
• Original Reinterpretation: While inspired by ancient forms, Bramante did not merely copy them. The Tempietto, for instance, was inspired by circular Roman temples like the Temple of Vesta, yet it remains an original creation characterized by its simple, harmonious, and centralized design.23
• Structural Innovation: His study of the Pantheon informed his ambitious plans for St. Peter’s Basilica, where he envisioned a massive dome raised on a drum, a concept that became a hallmark of his influence on future architects.2