Master of the Osservanza Triptych

The Master of the Osservanza Triptych, also known as the Osservanza Master and as the Master of Osservanza, is the name given to an Italian painter of the Sienese School active about 1430 to 1450.

The Italian scholar Roberto Longhi recognized that two triptychs formerly attributed to Stefano di Giovanni (il Sassetta) were the work of another hand,...
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