Francesco di Giorgio Martini

Francesco di Giorgio Martini (1439 – 1501) was an Italian painter of the Sienese School and a sculptor, as well as being, in Nikolaus Pevsner's terms: one of the most interesting later Quattrocento architects and a visionary architectural theorist; as a military engineer he executed architectural designs and sculptural projects and built almost seventy fortifications for the Federico da Montefeltro, Count (later Duke) of Urbino, for whom he was working in the 1470s, building city walls as at Iesi and early examples of star-shaped fortifications.