[6] It is believed that there was an earlier (Pre-Reformation Catholic) church on the site dedicated to local saint Ibar of Beggerin.

The current building is believed to date from some time after the Restoration of King Charles II in 1660.

[7] In 1690, the Rector of St Iberius, Alexander Allen, accused then Mayor of Wexford, Edward Wiseman, of inciting vandals to demolish the altar and pews and steal vestments and books.

[8] The church is built to a cruciform plan and is wider than it is long (supposedly to fit next to the old town walls), with an upper gallery which was used originally to seat Wexford's large population of soldiers.

[8] Restoration work took place in 1990, with balustraded serpentine communion rails being moved to St Iberius from St. George's Church, Dublin.