The original earthen and wooden fort stretched around the Studentski Trg and Knez Mihailova Street. The oldest Roman graves were discovered in this section, dated to the 1st and early 2nd century. Thermae were located in the Čika Ljubina Street. Also in the Čika Ljubina, remains of the house from the 4th century was discovered in 2008, which included the part of the floor and doorstep of the main entry door. Parts of the walls were decorated with frescoes. An aqueduct was used to conduct water from the modern Kumodraž area. At some point it was joining the aqueduct from the Mokri Lug and then continued further to the castrum. Both Mokri Lug and Kumodraž are hills, so the natural inclination allowed for the water to flow downhill to Singidunum. Aqueducts passed through the modern center of Belgrade, Terazije, and along the Knez Mihailova.