Ben Arous is a city in north-eastern Tunisia, part the agglomeration of Tunis, also called Grand Tunis. It is located south of Tunis city centeā¦Ben Arous is a city in north-eastern Tunisia, part the agglomeration of Tunis, also called Grand Tunis. It is located south of Tunis city center and is the capital of the Ben Arous Governorate. East Ben Arous is on the Sidi Fathallah Plain, and is named after Muslim saint Sidi Ben Arous who died in 1444. It is known in legend as a site for curing female infertility. A farm was laid out on the plain where Sousse Road is planned to be built. The Sidi Fathallah Plain is the site where the battle of Ad Decimum was fought. This battle was the beginning of the end of the domination by the Byzantine Army General Belisarius, on September 13, 523 AD.