John Leland, writing before 1540, was the first antiquarian to describe the conspicuous, now tree-covered, mound in the grounds of Lord Bathurst’s Park, to the north of the former Tetbury Road:
“Nor far thens is a steepe round biry like a wind myl hill extra muros, cawlled Grismundes Tower, for Gusmumdes Tower, as theie say. The place is now a warren for conys, and there hath be fowned mennes bones insolitae magnitudinis, also two sepulchres ex secto lapide. In one was a round vessel of leade covered, and in it ashes and peaces of bones”
Quotation on Historic England’s Heritage Gateway.