Increasing prosperity in the town through copper mining during the 18th century led to the construction of a new church to serve the growing population.

He was a ruler from northern Britain who fled to Anglesey in north Wales when ousted from power, settling at St Seiriol's monastery at Penmon.

Planning for a replacement church began in 1787 when Thomas Williams, "the Copper King", offered £600 (approximately £96,300 in present-day terms).

[3][9][10] The new church was constructed on the same site as earlier buildings, set back from the road on the east side of Queen Street in the town centre.

[6] Some internal alterations were made in 1867 under Henry Kennedy, the architect of the Diocese of Bangor: tracery was added to the windows, a chancel arch and arcades inserted, and the galleries removed.

There is a tower at the centre of the west end, which houses a clock and a bell-chamber behind large arched windows; it has a parapet with pinnacles at each corner.

[5][11] The 19th-century Welsh antiquarian Angharad Llwyd described the church as a "spacious handsome structure",[10] and Samuel Lewis (a writer of topographical guides in the 19th century) described the church in very similar words as a "spacious and handsome structure"; he particularly noted the "lofty square embattled tower crowned with pinnacles.

"[9] A 2009 guide to the buildings of north Wales describes the 19th-century alterations by Kennedy as "egregious", but says that the interior "possesses considerable grace", with the columns of the arcades being "touched by a breath of classicism".