Evidence Performed by Leonardo da Vinci

This high-stakes professional commission for the Confraternity of the Immaculate Conception in Milan represents Leonardo's most prolonged operational bottleneck and legal dispute. Tasked with delivering a centralized painting for a church altarpiece, Leonardo executed a masterpiece, but immediately ran into a financial and timeline conflict with his patrons over payment valuations. Refusing to settle or deliver the physical painting, Leonardo exploited a project management loophole to sell the completed first version (now in the Louvre) to a private buyer. The resulting litigation dragged on for over two decades, culminating in a legally binding state decree that forced Leonardo to return to Milan and spent years executing an entirely separate second version (now in London) to finally satisfy his contractual obligations 25 years after the initial signing.