Eynesford is a village sited 7.7 miles N of Sevenoaks in Kent; there are the remains of a motte and bailey castle (built 1088) a short distance away. The church of St Martin is built of flint with stone dressings with a tiled roof. There is a nave with a S chapel or transept and a N aisle, an apsidal-ended chancel and a W tower with inset broached shingled spire, and Galilee porch to the W of the tower. The sole Romanesque feature is the W doorway.

Domesday Book mentiones two churches in 'Elesford'. The patron was Christ Church, Canterbury.

Tim Tatton-Brown writes that 'The church at Eynsford is an exceptional early Norman church that was no doubt built by one of the Archbishop's principal knights, William, son of Ralph, son of Unspac, in the years around 1100. This William, the first of six generations of 'Williams de Eynesford', 'restored' this church to Christ Church Priory, Canterbury with all its appurtenances in about 1135. A little later William himself became a monk at Christ Church'.

The large rectangular area in the centre of the tympanum might have formerly held an inscription. The doorway shows unusual decorative motifs such as fish-scale carving, and both colonettes and imposts are carved differently, suggesting lively imagination on the part of the sculptors.