History of the Church Henge
The main earthwork at Knowlton is of a type known as a henge. There are nearly one hundred henges in Britain and Ireland, dating from about 3000 to 2000 BC. Although they are generally believed to have been ceremonial sites, it is likely that they fulfilled many functions, and may have changed their role through time.
http://www.english-heritage.org.uk/daysout/properties/knowlton-church-and-earthworks/history-and-research/
