When I first moved to Cirencester, the Obelisk was surrounded by brambles. Now thanks to the volunteers of AQIVA, the surroundings have been smartened up and an information board provided. Unfortunately, despite everyone's best endeavours, almost nothing is known!
CAHS - Cirencester Obelisk
Wilts & Glos Standard - Mystery of the Obelisk in Cirencester uncovered by AQIVA (article dated 08.10.2016)