(b Siena, bapt 23 Sept 1439; d Siena, bur 29 Nov 1501). Italian architect, engineer, painter, illuminator, sculptor, medallist, theorist and writer. He was the most outstanding artistic personality from Siena in the second half of the 15th century. His activities as a diplomat led to his employment at the courts of Naples, Milan and Urbino, as well as in Siena, and while most of his paintings and miniatures date from before 1475, by the 1480s and 1490s he was among the leading architects in Italy. He was particularly renowned for his work as a military architect, notably for his involvement in the development of the BASTION, which formed the basis of post-medieval fortifications (see MILITARY ARCHITECTURE & FORTIFICATION,
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