Looking for Early Nathan Family IN Wiltshire

My family search for my Coster line in Wiltshire ends with Eleanor Coster's grandmother Eleanor Nathan who married Thomas Cheter, and had william Cheter who i think is Eleanor's dad. I have Elenor Nathan and Thomas Cheter giving birth to William Cheter who was christened 18 Dec 1645 Idmiston Wiltshire. any possibilities of going further back with the Nathan line?
Many thanks