Seavington is 3 mi east of Ilminster, and about 5 mi from Ham Hill, a major source of stone. The village name is thought to originate from 'seven settlements (vills)' (VCH). The fabric was originally 13thc, but now mostly 15thc-16thc, in Ham stone roughly cut and squared, with ashlar dressings. The church of St Mary (not to be confused with St Michael Seavington) was restored in 1880 and 1882. It consists of a two-bay chancel and four-bay nave with S porch and W tower; the font is Romanesque. The church is now in the care of the Churches Conservation Trust.

Mauger de Cartrai held an estate called Sevenehantona of the count of Mortain in 1086 in succession to Alwin. In the 13thc. the church was a dependent chapel of South Petherton, which is 2 miles NE (VCH).

The octagonal font plinth is yet another example of one far too small for its burden: the top-heavy effect is most pronounced. Perhaps this 12th century font is evidence of an earlier building (Robin Downes).