Deiniol

Legacy His cult in North Wales was quite extensive and several churches are dedicated to him, including Worthenbury near Wrexham and Hawarden, Flintshire in the north of Wales (as well as other churches in Flintshire). There are also dedicated churches at Llangarron, Llanfor, Llanuwchllyn, Eyton, and Itton; near Cardigan Bay there is a village of Llanddeiniol - "parish of St Deiniol" - which was once the name of Itton.

The church of Marchwiel is dedicated to Deiniol and there are also dedications at Itton in Monmouthshire and Llangarron in Herefordshire.

William Ewart Gladstone dedicated St Deiniol's Library, a residential library in Hawarden, Flintshire, for arts students, in 1896.

In the current Roman Catholic liturgical calendar for Wales and that of the Anglican Church in Wales, he is commemorated on the traditional date of 11 September.

His name has been given to the Deiniol Centre, a shopping centre in Bangor.

He may be referenced in the name of the hymn tune, St. Denio ("Immortal, invisible").