It is named after the church, founded in the 6th century by Saint Saturninus, who together with his wife, is commemorated by an early Christian monument.
St Sadwrn's Church is a Grade II*-listed building.
[2] Close to the village was the site of the excavations that revealed the existence of Bryn Eryr Iron Age farmstead.
[3] Andrew Crombie Ramsay (31 January 1814 – 9 December 1891) was a famous Scottish geologist.
He died at Beaumaris in Anglesey and is buried at St Sadwrn's church, Llansadwrn where a glacial erratic boulder marks his grave.