Donato Bramante
From Conservapedia
Donato Bramante (1444 - 1514) was an Italian architect. His main works are S. Maria Della Pace and Tempietto of San Pietro, both in Italy.
In his work, Bramante changed conventional architectural space by inserting illusionistic features more typical of painting and stage settings. In his Roman projects, particularly those for St. Peter's, he achieved the "grand manner" which indirectly led to Mannerism.[1]