The castrum is situated on the Bürglen hill in Irgenhausen, a village of the municipality of Pfäffikon in the canton of Zürich in Switzerland.

The native name of the fort is unknown; Irgenhausen was mentioned in AD 811 as Camputuna sive Irincheshusa, so maybe the castrum's name was Cambodunum, the Roman name of the neighboring village of Kempten.

[1] In 1897, stones of the ruined building (believed at the time to be those of a medieval castle) were used for the construction of a factory nearby; the dilapidation was stopped by the Antiquarische Gesellschaft in Zürich in order to start archaeological investigations, carried out between 1898 and 1908, and to preserve the walls.

Walter Mittelholzer made an aerial exploration of the fort and the surrounding area, whereupon in the closer environment Roman villae rusticae, among them one in Kempten, were localized and excavated.

The other theory, based on the Roman coins found inside the castrum, dated the construction from 364 to 375, in the era of the Emperor Valentinian II.

The materials used by the Roman soldiers derived from glacial deposits, furthermore, there is a mixture of sernifit from Glarus, limestone and conglomerate.