The site for his monastery and monastic school at Cloyne (Irish: Cluain Uamha or "Meadow of the Caves") was donated by Coirpre Cromm mac Crimthainn, King of Munster.

In the 885 raid, the abbot, prior, and several others were killed, and Cloyne is not mentioned in the monastic annals again until 1060.

[6] A girl named Mary Smyth died in 1675, and was buried beneath the floor of the nave.

Her burial place is marked with a horseshoe (the symbol of the farrier, or smith) carved into the ground.

The north side of the churchyard wall was blown over, and 88 panes of glass in the cathedral was shattered.

[5] Theses renovations included a new ceiling, new choir stalls, the removal of the gallery on the western wall, and the relocation of the organ.

[8] Renovations were carried out to plans by Arthur Hill, the costs of which were covered by an anonymous donor from India.

[13][14] Arched windows in the south transept of the cathedral are an example of Early English Gothic architecture.

[17] The cathedral features several stained glass windows including one depicting Saint Colmán.