The remains consist of grass-covered earthworks, and are considered among the best preserved Roman earthworks in Britain. The site, which has a complex history, comprises two intersecting forts. The earliest fort is believed to be associated with the campaigns of Agricola. The later fort was apparently reconstructed within two outer ditches so that this later fort was protected by five ditches on both the east and north sides. The field to the north is the remnant of a large annexe. Archaeology has demonstrated the existence of a watch-tower and at least six overlapping marching camps to the north and northeast. Ardoch was one of a chain of camps separated by one-day marches in a generally north-south direction. Other Roman camps in this chain include Strageath, Inchtuthil, Battledykes, Stracathro, Raedykes and thence taking the Elsick Mounth trackway to Normandykes.
Name
The fort has sometimes been identified with the "Alauna" mentioned in Ptolemy's Geography. Ptolemy placed Alauna in the area occupied by the Damnonii tribe, and the name may be associated with the River Allan which flows about one mile to the south of the fort. However the identification of Ardoch with Alauna is considered tentative.
Later history
The site was reused in the medieval period when a chapel was built near the centre of the fort. The remains of the graveyard enclosure and the site of the chapel are the only archaeological remains which are visible within the fort. In 1726 Alexander Gordon claimed that at Ardoch Roman Fort a subterranean passage was said to run from the fort, under the River Tay to the fort or 'Keir' on Grinnin Hill. This tunnel was said to contain a great deal of treasure. Ardoch was visited by Queen Victoria and Prince Albert in 1842, although only Albert investigated the earthworks, Victoria preferred to remain in their carriage.
Ownership and access
Ardoch Roman Fort is part of the Ardoch estate, and is in private ownership, although access is allowed at reasonable times. To the north, the earthwork remains of two Roman marching camps, known as Blackhill Camp, are in the care ofHistoric Environment Scotland.