Cotehele stands just on the Cornwall side of the river Tamar that forms the boundary with Devon. The estate was the ancient seat of the Edgcumbes, but by the 18th century it was a secondary residence, with the family preferring nearby Mount Edgcumbe, overlooking Plymouth Sound. On high ground above the house at Cotehele stands this solitary three-sided tower, of which little seems to be known. No inscriptions give even a hint of its history.