Mither Tap hillfort

The ramparts on Mither Tap most likely began in prehistory, long before the fort took the form visible today, but radiocarbon dating shows the site was intensively used during the early medieval Pictish period. Charcoal recovered from an internal building deposit near the entrance produced dates of AD 340–540 and AD 640–780, confirming occupation across several centuries in which this part of Aberdeenshire lay within Pictish territory.

In the 1870s the archaeologist Christian Maclagan carried out one of the earliest formal investigations of the fort, walking and recording its ramparts and internal features by eye. She published a detailed plan in 1881 that mapped the upper and lower ramparts together with possible round structures in both citadels, and marked the position of a well in the lower enclosure — a record that would guide excavators working on the site more than a century later.

In 2007 a watching brief accompanied the construction of a new path near the fort's entrance, funded by Forestry Commission Scotland and carried out by the archaeologist Dan Atkinson. Two stone blocks were found crossing the line of the new path, sitting above a compact spread of cobbles; beneath these a small excavated sondage reached a gravelly-silt surface directly on bedrock, interpreted as the floor of a building, possibly one of the roundhouses Maclagan had earlier suggested.

Oak charcoal recovered from that floor deposit during the 2007 work was radiocarbon-dated to AD 340–540 and AD 640–780, the first scientific confirmation that people were living inside the fort during the Pictish period. A loose concentration of heat-affected but unvitrified stones found nearby was read as collapsed rubble from a hearth or structure rather than evidence of the fort itself having been burned.

In June 2019 the Northern Picts project, based at the University of Aberdeen, opened seven trenches across the fort in its first large-scale scientific excavation. On the outer rampart, a raised building platform built from granite slabs on rubble mounds was uncovered alongside a midden containing cattle, sheep and fish bone, while a separate trench confirmed Maclagan's well as a stone-lined shaft with steps keyed into the rampart and traces of a clay waterproof lining.

A trench on the south-east side, previously assumed to sit over part of the outer defensive bank, instead produced stonework that the excavators suspected belonged to a sub-rectangular building rather than a rampart, though they judged that larger trenches would be needed to settle the question. From within the same area came fragments of iron, an intact crucible and slag, together with handmade pottery — direct evidence of metalworking carried out inside the fort.

Further trenches in the upper citadel and on the central tor recovered animal bone, teeth, charcoal and a gaming piece from occupation layers, alongside repeated pockets of heat-affected soil marking where fires had been lit again and again in the same spots. Taken with the metalworking debris, these finds have led archaeologists to see Mither Tap as a regional centre of the Pictish territory of Cé, and possibly a hub for elite or ceremonial activity rather than a purely defensive stronghold.