When was Duccio confirmed as the painter of the Rucellai Madonna?

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Duccio: The Virgin Enthroned with the Child, Surrounded by the Patrons of Siena, Angels, and Saints — Duccio *The Virgin Enthroned with the Child, Surrounded by the Patrons of Siena, Angels, and Saints*, central panel of the *Maestà*, tempera on wood panel by Duccio, 1308–11; in the Siena Opera della Metropolitana, Italy.

Although the contract for the Rucellai Madonna was commissioned in 1285, it was not until 1930 that it was indisputably determined that the document referred to the painting now known as the Madonna Rucellai.1

Prior to this confirmation, the masterpiece was long attributed to the Florentine painter Cimabue, a view popularized by the early biographer Giorgio Vasari.1