During which time period were artist keenly interested in using the golden ratio in their paintings?

The time period when artists were keenly interested in using the golden ratio in their paintings was during the Renaissance (14th to 17th centuries). Artists such as Leonardo da Vinci used the golden ratio and other principles of proportion and harmony to create aesthetically pleasing compositions in their works. The golden ratio, also known as the divine proportion or the golden mean, is a mathematical ratio of approximately 1.618 that is believed to represent perfect proportions and beauty.