The present church was built in the 13th century and stands near the Roman fort in Holyhead.

Cybi chose to build his monastery within the walls of a ruined Roman fort.

[1] The present church of St Cybi's was built in between the 13th to 16th centuries and stands near the walls of the Roman Caer Gybi.

A sun dial with the inscription "Yr hoedl ar hyd ei haros a dderfydd yn nydd ac yn nos", which translates to "Life though long it stay will end in night and day", is located on the south transept.

[1][2] Media related to St Cybi's Church, Holyhead at Wikimedia Commons