Evidence of early medieval habitation at Lewannick is in the form of two inscribed pillar stones, each having text in both Latin and ogham characters; on the basis of the ogham text, these stones have been dated as having been inscribed between the fifth and sixth centuries.
One is located in the village churchyard, and was dedicated to a "Ingenuus"; the other has been moved inside to the church nave, and both texts mention an "Ulcagnus".

Two miles south-west, in the valley of the River Inny, are the fragmentary remains of the medieval Upton Castle.

Arthur Langdon (1896) records two Cornish crosses in the parish: one is Holloway Cross at a road junction one and half miles north of the churchtown; the other is a cross head in the grounds of a house called Trelaske.
Trelaske was a country house until it was demolished in the 1950s.

Trekelland Bridge is a Grade II* listed road bridge over the River Inny probably built in 1504.
This may be the bridge near Launceston for which Bishop Oldham issued an indulgence in 1504.
It has two large arches and a smaller arch and is built of granite ashlar.
It is one of the best-preserved and most beautiful of Cornish medieval bridges.
Evidence of early medieval habitation at Lewannick is in the form of two inscribed pillar stones, each having text in both Latin and ogham characters; on the basis of the ogham text, these stones have been dated as having been inscribed between the fifth and sixth centuries. One is located in the village churchyard, and was dedicated to a "Ingenuus"; the other has been moved inside to the church nave, and both texts mention an "Ulcagnus".
Two miles south-west, in the valley of the River Inny, are the fragmentary remains of the medieval Upton Castle.
Arthur Langdon (1896) records two Cornish crosses in the parish: one is Holloway Cross at a road junction one and half miles north of the churchtown; the other is a cross head in the grounds of a house called Trelaske. Trelaske was a country house until it was demolished in the 1950s.
Trekelland Bridge is a Grade II* listed road bridge over the River Inny probably built in 1504. This may be the bridge near Launceston for which Bishop Oldham issued an indulgence in 1504. It has two large arches and a smaller arch and is built of granite ashlar. It is one of the best-preserved and most beautiful of Cornish medieval bridges.
Lewannick