The Gatehouse website record for Lanherne

In the civil parish of Mawgan In Pydar. In the historic county of Cornwall (Modern Authority of Cornwall, 1974 county of Cornwall).

Convent which was the former house of the Arundell family, it is dated to C16 and includes an earlier building. Later additions can be dated to C17, C18 and C19 and include the chapel. The building consists of 2 parallel ranges with the inner range the earlier. Ditch remains on west side of house. The house was built by one of the earlier Arundells in whose family the Manor had been since 1231, when the marriage to Lady Alice Fulcar, heiress of Lanherne, the manor passed to Sir Remphrey Arundell.
PastScape records 'There was doubtless a Celtic monastery at Lanherne whose lands passed to the diocesan bishops before 1085.' but I'm not aware of any suggestion this was a residential manor of the bishops. The location, by the church and at a crossing point of the Vale of Mawgan, is that of a local administrative centre but there is no suggestion of any earlier use of the site, other than the Celtic monastry.

The Ordnance Survey Map Grid Reference is SW87196591

Sources of information, references and further reading

This site's English Heritage (PastScape) Defra or Monument number is 429177
Further information may be available from the holder of the county Historic Environment Record. In particular 'grey' literature, such as watching brief reports, held by H.E.R.s is often poorly referenced and is unlikely to be recorded in this website, or elsewhere.

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The bibliography owes much to various bibliographies produced by John Kenyon for the Council for British Archaeology, the Castle Studies Group and others.
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*The listed building may not be the actual medieval building, but a building on the site of, or incorporating fragments of, the described site.