The 16th-century Italian artist undermined the Renaissance-era rules of illusionistic space with this playful, virtuosic ...

The frequency of Holy Years has changed over time: at first, they were celebrated every 100 years; later, in 1343 Pope Clement VI reduced the gap between Jubilees to every 50 years, and in 1470 ...

Their child, Giulio de'Medici, was later crowned Pope Clement VII. Clement took a black slave girl as a mistress. Their child, Allessandro, became the first black head of state when he was made ...