A 12th-century pope had decreed that two trips to St Davids were equal to one to Rome – turning it into a centre of pilgrimage for the entire Western world.
Datganodd pab yn y 12fed ganrif fod dwy daith i Dyddewi gywerth ag un i Rufain – gan droi’r cyntaf yn ganolfan i bererinion o bob rhan o’r byd gorllewinol.