Arcobara [7] (previously identified as Arcobadara [8][9][10]) also known as Castra of Ilișua was a fort in the Roman province of Dacia in the 2nd and 3rd centuries AD.

[2] It was unearthed in the village Ilişua (commune Uriu, Romania) in 1978.

[11] On the site 27 stone ballista projectiles were discovered of diameters between 7 and 13.5 cm and weighing up to 2 kg[12] indicating the presence of ballistarii.

2.Possibly during the early years of Hadrian's reign ala Tungrorum Frontoniana was stationed here, leading to an enlargement of the fort.

3.The last phase of the fort included a leveling of some of the previous buildings and fortifications and the construction of stone walls.