He took a lifelong vow of poverty and begged for his daily bread, yet he spent his days working with sheets of pure gold and ultramarine pigment more expensive than gold itself. His patrons were the wealthiest, most powerful people on earth, the Medici dynasty and two popes.

This episode traces how a young painter named Guido di Pietro became Fra Angelico, the humble Dominican friar who accidentally became one of the most important pioneers of the early Renaissance. It is the story of balancing your deepest values against the flashy, high-stakes demands of the people who pay you, told through frescoes, mathematics, and a treasure hunt that ended in an Oxford guest bedroom.

• Why ruthless banker Cosimo de’ Medici funded a monastery for beggars and kept a personal monk’s cell there
• How Angelico abandoned flat gold Gothic backgrounds and pioneered linear perspective and the Sacra Conversazione
• The way he synthesized the Pope’s demand for golden spectacle with his own focus on raw human emotion
• The direct artistic lineage running from Angelico through Gozzoli and Ghirlandaio to Michelangelo and the Sistine Chapel
• How two looted altarpiece panels bought for around 400 dollars sold for 1.7 million pounds once their true creator was identified