This chapter focuses on one particular feature that connects many of the new foundations: the introduction and adaptive use of the centralized gridiron plan, a common spatial arrangement found in various contexts over time and space. The boom period of new town foundations in medieval Europe was the thirteenth and fourteenth centuries. The town of Sandomierz, also in historic Lesser Poland, in the Vistula valley about 150 kilometres north-east of Cracow, shows many common features with the previously discussed Central European examples. Whereas the grid plan was frequently implemented in practically all other polities of East Central Europe, in the Kingdom of Hungary the clear and genuine form of this morphological type seems to have been the exception rather than the rule. The processes of laying out the grid plan, reconstructed hypothetically on the basis of the end result for the European examples, stand here in a clear and logical sequence.