The meaning of Eynsford is unclear, although has been suggested; this was taken from 'Egenes home', being the first written record in 864.
The church dedicated to St Martin was built on the site of a Saxon chapel in the late 11th Century. The west tower and then the porch were added in the 13th Century. When the clock on the tower was repaired in 1904, a local benefactor, Elliot Downs-Till, had the words of Robert Browning inscribed on the oak frame; 'grow old along with me, the best is yet to be'. The spire was re-shingled in 1988, local residents, including children from the primary school, each wrote their name on the underside of the shingles. As Lords of the Manor prospered, many improvements were made.
In 1066 when William of Normandy conquered the Saxons and was crowned King of England, he rewarded all the Norman Knights who had fought with him. He gave Unspac the lands of Eynsford. Ralf, son of Unspac built Eynsford castle out of the local Kentish flint and re-named himself William d'Eynsford, out of respect for his king.
A railway station at Eynsford was opened on the Swanley to Sevenoaks line in July 1862.
