Another mound in a london park, another mess of modifications & history.
Like Henry VIII Mound, this was last used as a Belvedere. It had a possible 18th/19th century summer house on top, together with a spiral path for presumably easy access.
From GLSMR: Originally it was probably a Roman era mound as it is too large to be a bell barrow. It has a ditch around it, a 10-15ft berm and as far as I can tell it has never been excavated.