Francesco Borromini, byname of Francesco Castelli, was an Italian architect born in the modern Swiss canton of Ticino who, with his contemporaries Gian Lorenzo Bernini and Pietro da Cortona, was a leading figure in the emergence of Roman Baroque architecture.

Pietro da Cortona was an Italian Baroque painter and architect. Along with his contemporaries and rivals Gian Lorenzo Bernini and Francesco Borromini, he was one of the key figures in the emergence of Roman Baroque architecture. He was also an important designer of interior decorations.