Born near Urbino and trained as a painter, Donato Brampton turned his architectural design to the beginning of his career. A little known about his activities until about 1481, when he joined the Sforza court in Milan, where he was known to Leonardo da Vinci. In 1499, Bremante settled in Rome, but the work started slowly. The architect was in 60s when he was working on the site to create a small temple where the apostle Peter was killed on the cross.
The Tempietto Iseo, known as Tempietto di San Pietro in Montorio, has been praised because it was created as a definition of early complete renaissance of Vitruvius's theories. Without copying any specific ancient monument inspired by the fossils of Rome's small round temple, Bramante had formed only 15 feet in diameter with one-legged base and Doric peristyle. Vitruvius advised that the Doric order would be used for temples, especially for the powerful characters of the gods. The first story of the temple is topped by a large drum or rounded wall, reminiscent of the ancient Roman round tomb in the hemispheric dome. It is particularly noteworthy that the pagan effect of the outer part of the building makes its sign of light wall and shadow contrasts, the sculpted spinach's eyebrows are made by the Doric Freeze and its magnificent balustrade.
Shortly after the election of Julius II as the Pope in 1503, he ordered Brampton to reconstruct the Vatican Palace, and in 1506 Julius appointed Peter Peterson's Basilica as the chief architect of the project in the site of Peter's grave site, Vatican. Construction began rarely when Julius died in 1513; in 1514, Bramante could not complete the successor without leaving a comprehensive plan or model. After the pop and architects and series of various researches, when the construction of New St. Peter was not completed yet, Michelangelo undertook the project in 1546.