Sennen parish church is dedicated to St Sinninus (St Senán), a sixth century Irish saint, but has also been dedicated to St John the Baptist. There has been a church here since at least the 15th century. In 1327 and 1430 the patron of Sennen is described as a female saint Senana. However in later times it has been assumed that Senanus is the patron saint. The identification of this Cornish saint with St Senan of Scattery Island appears to have no foundation.
The present church has a chancel and nave, a south aisle and a north transept. A wall-painting depicting two round embattled towers was uncovered during restoration in 1867. There is also a headless alabaster figure representing the Virgin Mary in the transept. The church has a three-stage battlemented tower housing a ring of three bells.
There are five Cornish crosses in the parish. One is at Escalls and another at Sennen Green. Trevilley cross is one of only two crosses with a crucifixus figure on a cross carved onto the stone (there is a cross on the other side of the head). A cross on the churchyard wall came from a site near the Giant's Stone. A fine cross in the cemetery adjoining the churchyard was found in use as a footbridge near Trevear and moved to the churchyard in 1878. About 1890 it was moved to its present position.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.