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For several centuries the church has been noted for the three inscribed stones which were associated with its churchyard. Today they stand inside the church against the west wall of the south aisle. The centre one, bearing the inscription "SOLINI FILIUS VENDONI" (Solinius son of Vendonus) commemorates Solinus who went on an unsuccessful missionary journey to the Scots in Ireland in 431 AD. Solinus returned to Wales and died in 432 AD. On the right of the Solinus stone is the Eturnus stone which carries the inscription "ETERNI FILI VICTOR" (Eternus the son of Victor) who probably died in the early 7th Century.
The stone is of spotted dolerite from Carn Menyn, which was also used for the Bluestone Circle at Stonehenge. The third stone reads "DOBITUCI FILIUS EVOLENG" (The stone of Dobitucus, son of Evolengus) which may date from the 5th or early 6th Century. The Eturnus and Dobitucus stones also have inscriptions in old Celtic Ogham script. Much more information about these stones can be found in the Guide about St Clydai's Church.