Luigi Lanzi,
The History of Painting in Italy…
“ Pietro da Cortona and his followers. After the middle of the seventeenth century, the Florentine school, and also that of Rome, underwent a remarkable revolution, occasioned by the vast number of the followers of Pietro da Cortona. Sects in painting have the same fate as sects in philosophy: one succeeds another; and the new principles are propagated more or less rapidly, according to the degree of opposition they have to encounter where they happen to be diffused. The manner of Cortona met with considerable opposition in Rome, as we shall find in the proper place. ”
