 The entire Singidunum was surrounded by vast necropolises and the main and the largest ones stretched along today's boulevard, where numerous graves, grave steles and sacrificial altars were discovered.In Ottoman period, Turks built a major cemetery in the lower part of the modern boulevard, spreading from Batal mosque (location of the modern House of the National Assembly of Serbia) to Tašmajdan.During this period, the route of the Bulevar was a famed Tsarigrad Road (Constantinople Road), officially bearing that name to 1849.