Ad Pirum was a Roman fortress active during the time of the late Roman Empire.

It is located on the Hrušica Plateau in southwestern Slovenia, in the hamlet of Hrušica in Podkraj.

[1] Excavations reveal the fortress to have an oval shape, 250 metres (820 ft) in length, 30 to 80 m (98 to 262 ft) in width, and with a wall at a height of 6–8 m and a thickness of about 2.7 m; the wall towers were 10 m high.

[2] This structure represented a major fort of the Claustra Alpium Iuliarum, a network of forts and walls to securing Roman Italy from eastern invasions, including the road between Roman Italy and Pannonia.

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