Francesco di Giorgio Martini

Francesco di Giorgio Martini (1439–1501) was a Sienese painter, architect and military engineer, trained in Vecchietta's workshop. From the mid-1470s he served Federico da Montefeltro, Duke of Urbino, building nearly seventy fortifications, among the earliest star-shaped bastions, and designing Santa Maria delle Grazie church at Cortona.

His Trattato di architettura, completed after 1482, set out ideal-city plans and machines; Leonardo da Vinci owned and annotated a copy. He returned to Siena as city engineer in 1486, and in 1499 became capomaestro of Siena Cathedral.