The tower, said to be late C15 (VCH), is of three stages with angle buttresses and battlements.
The south aisle windows are C16 with round heads to the lights.
The south porch door, said to be C14, has a hood and moulded imposts.
The inner door is C13, having a two-centred arch of two moulded orders and outer shafts with moulded bases and moulded capitals with nailhead ornament.
The nave roof, said to be dated 1527 on a wall plate (VCH), has arch-braced collars, the end trusses having raking queen struts and a king strut between collar and tie.
The west gallery of 1736 is supported on four stone Tuscan columns said to be Roman.
Bremetennacum, was a Roman fort on the site of the present day village of Ribchester in Lancashire. The site guarded a crossing-point of the River Ribble. The first known Roman activity was the building of a timber fort, believed to have been constructed during the campaigns of Petillius Cerialis around AD 72/3. This was replaced by a stone fort in the 2nd century. The most famous artifact discovered in Ribchester, and dating from the Roman period, is the elaborate cavalry helmet. The helmet was discovered, part of the Ribchester Hoard, in the summer of 1796 by the son of Joseph Walton, a clog maker. The boy found the items buried in a hollow, about 10 feet below the surface, on some waste land by the side of a road leading to Ribchester Church, and near a river bed. https://en.wikipedia.org/wiki/Bremetennacum
The sandstone font is octagonal with slim corner buttresses.
In the east bay of the south arcade the Hoghton Quire is enclosed by a restored C16 oak screen.
The north chapel, or Dutton Quire, has in its east window fragments of glass said to be C14.