The church is dedicated to Saint Tethe who was one of the twenty-four children of St Brychan, a 4th-century Welsh saint and king. The church was a Norman foundation but was rebuilt in the 15th century. It is large, with a nave and two aisles. The lower part of the tower is Norman. The church was collegiate until 1545 when the two prebends were abolished.
St Teath was the birthplace in December 1626 of Anne Jeffries, a woman said to have associated with fairies.