The presence of a water spring known locally as 'The Source' behind the southern wall of the old church, is believed to be the reason why humans first settled in the area where present-day Bonchurch is located. A prehistoric race lived in the area around the Undercliff, land which was wild forest. Evidence has also been found showing that the people that lived during the Stone Age had lived near to the water spring. Five burial mounds have been discovered at St. Boniface Down. Evidence has also been discovered showing that the Romans established a settlement in the area.