The name derives from the Celtic Saint Marwenne (Morwenna) who is thought to have founded a hermitage here around the end of the fifth century. Marwenne was one of the twenty-four children of St Brychan, a Welsh saint and king.
Marhamchurch parish church is dedicated to St Marwenne. Most of the present church is of the 14th century; in the 15th century an aisle and porch were added. In the early 15th century the existence of an anchorite's cell occupied by an anchoress called Cecilia Moys is recorded. Features of interest include the four-holed cresset stone and a Norman quarter-capital (though this is unlikely to be a fragment of the Norman church which may have preceded the present building). St Marwenne was probably the same as Morwenna of Morwenstow. In the 9th century the district was probably on the border between Cornwall and Devon and the farms in the parish have Saxon names unlike those of Poundstock on the other side of the River Neet.
Marhamchurch was recorded in the Domesday Book (1086) when it was one of several manors held by Hamelin from Robert, Count of Mortain. There was one virgate of land and land for 2 ploughs. There was one plough, 1 serf, 1 villein, 2 smallholders, 20 acres of pasture and 20 sheep. The value of the manor was 6 shillings though it had formerly been worth 10 shillings.
Marhamchurch Revel is a festival held every year, on the Monday after 12 August in Marhamchurch. During the festival a Queen of the Revel is chosen from the village schoolgirls and crowned by Father Time in front of the church where St. Morwenna's cells are said to have stood. Following these events a procession led by the local band and the newly crowned Revel Queen then proceeds through the village to the Revel Ground. Here the villagers are entertained with a show of various entertainments.
- Ordnance Survey: Landranger map sheet 190 Bude & Clovelly ISBN 978-0-319-23145-6
- "parish population 2011". Neighbourhood Statistics. Office for National Statistics. Retrieved 25 March 2017.
- Charles Henderon proposed that a slab of pierced greenstone 32 in x 22 in x 4 in reused in the west wall had been the window of the cell on the north side of the chancel.
- Cornish Church Guide (1925) Truro: Blackford; pp. 153-154
- Thorn, C. et al., ed. (1979) Cornwall. Chichester: Phillimore; entry 5,5,5
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