Renaissance Town: Rethinking the Urban Scheme Urban theorists and ideal towns: Leone Battista Alberti -- De Re Aedificatoria, published 1485 Filarete -- Sforzinda (plan) Francesco di Giorgio -- angled bastion (plan of Lucca with angled bastions added) (Cateneo, ideal city plan) Leonardo da Vinci (city on two levels) Sabbionetta, Livorno, Palma Nova (plan)