Evidence of early medieval habitation at Mawgan is in the form of an inscribed pillar stone, located at the meeting of three roads at the center of the village; it bears an inscription that is no longer readable, but based on an old drawing and a photograph taken in 1936 it could have been a memorial stone to either 'Cnegumus son of Genaius' or 'Genaius son of Cnegumus'. The date of this inscription is not certain beyond having been carved before the twelfth century.
At Trelowarren is the estate of the Vyvyan family who have owned it since 1427. The Halliggye Fogou at Trelowarren is the largest in Cornwall. Trelowarren House has a complex building history: the original house is mid 15th century and there are later parts dated 1662, 1698 and ca. 1750 (further additions were made during the 19th century).