GIORGIO, FRANCESCO (1439-1502), Italian engineer, architect, painter and sculptor, was born on Nov. 14, 1439, at Siena, and died there in 1502. He was engaged on constructive and decorative work in his native town from 1463 to 1478 when he was employed by the duke of Urbino as architect and military engi neer. In 1490 he constructed the model for the dome of Milan cathedral, and five years later invented the mines used at the siege of Naples. Some of his pictures, which show the influence of Fra Filippo Lippi, are now in the Siena gallery.
His Trattato di architettura civile e militare was edited by C. Saluzzo in 1841.