['< sod > according to [ [ radiocarbon dating ] ] conducted on in connection with an archaeological excavation in the summer of may 2007, today the ringfort mostly dates from the early 10th to mid - 12th century. subsequent occupation deposits indicate the fort was used from around the early 10th 1st century to the early 13th century. the perhaps later medieval structure a with a rectangular outline was likely built early between ca the early 15th and mid - 17th century. < ref and name = " report " / > { { rp | 28 } } < eod > < sod > nan < eod >']