[1][2] It was first recorded by Thomas Pennant in 1769, on a hillside in Strathearn, a little to the north of (and on the opposite bank of the River Earn from) Forteviot and Dunning.
In 2002 it was placed in the care of Historic Scotland, and was placed for preservation under the 11th/12th-century tower of St Serf's Church, Dunning.
This name is taken as the Latin form of the early 9th-century Pictish king's Gaelic name Caustantín son of Fergus (fl.
Since the inscription implies that the cross was carved either during, or shortly after, the reign of Caustantín, it is particularly important as giving a fixed point in the chronology of Pictish sculpture.
Other carved themes on the cross include a rider with an oversized head and ponytail showing him to be a man of authority.