The ground was then used as a washing-green. The deliberate destruction of Arthur's O'on had so appalled Sir James Clerk, that in 1767 his son, also Sir James Clerk, decided to have a dovecote built, as an exact replica of the temple, on his stable block at Penicuik House. The dovecote still exists. The first record is in the 9th century by Nennius, a Welsh historian, in his "Historia Brittonum". He was a monk studying under Bishop Elfodd, and gave a brief description of the building, and asserted, without hesitation, that it was erected by the usurper Carausius, who assumed the purple in Britain in the year 284. He also mentioned that a triumphal arch was built near it, in honour of the same individual. It is shown on Timothy Pont's map, on that of John Adair and of Sir Robert Sibbald, who in the 16th century recorded it as a 'temple'. In 1723 it was described as being "in the form of a sugar loaf" in an account of Larbert parish, which adjoins Stenhousemuir. In 1719 Andrews Jelfe, an architect, visited and made careful drawings and measurements on behalf of the antiquarian William Stukeley, which were later published as part of a treatise on the O'on.