[2] The rebellion of Owain Glyndŵr resulted in part of the cathedral being reduced to a ruin for seventy years.

The present building was largely built in the reign of Henry Tudor and greatly restored in the 19th century.

[6] Geoffrey of Monmouth served as Bishop of St Asaph from 1152 to 1155, although due to war and unrest in Wales at the time, he probably never set foot in his see.

William Morgan (1545 – 10 September 1604) was also Bishop of St Asaph and of Llandaff, and was the first to translate the whole Bible, from Greek and Hebrew, into Welsh.

In August 2018, the cathedral took the controversial step of making its music staff redundant, citing financial pressures.