
The contract survives, and it asked for almost nothing. The scripta — the document setting out what Sassetta was to paint — required only the moment when Saint Francis was shown that palace. What he gave them was a castle in the sky with white banners and red crosses flying from its battlements, over a young man asleep in a gilded bed who had that day handed his clothes to a ragged knight. The altarpiece held almost sixty panels. Twenty-eight of them survive anywhere in the world.
Sources: The National Gallery, London, 'Saint Francis and the Poor Knight, and Francis's Vision', NG4757, 1437-44; read 2026-08-27. · The National Gallery, London, 'The San Sepolcro Altarpiece'; read 2026-08-27.
Printed on demand. Public-domain masterwork, reproduced from a 6,000 px master of the original. The whole image is printed — never cropped to fit the sheet — so every sheet carries an archival margin, and the dimensions and resolution listed above are the ones you receive.