St Davids 5 is a smooth, rounded, cross-carved boulder. It is located in the lapidarium Porth y T'r, St Davids Cathedral (NPRN 306). It was first discovered during repairs in 1955, built into the thickness of the late 13th-century boundary wall of the Bishop's Pallace, east of the gateway. It was deposited in the cathedral, moved to the basement of St Mary's Hall in 1994, and to its current location in 2000.

The stone has carving on the upper half of three of its faces. Dimensions are given as 33cm height x 16.5cm width x 9cm max. diameter. Face A is lightly incised with an outline equal-arm cross with a slight depression in its centre. Face B has a lightly incised inscription in Greek letters, reading vertically downwards and translated as `Christ?. Face D has a lightly incised inscription in Greek letters, reading vertically upwards and translated as `Alpha, Omega?. The carving is thought to be 9th- or early 10-century in date, and is one of a group of similarly-carved grave-markers associated with St Davids and other sites in western Pembrokeshire: see St Davids 4 (NPRN 423493), St Edrins 2 (NPRN 423596), St Edrins 3 (NPRN 423597) and Walton West 1 (NPRN 423677).

Sources include:
Edwards, N. 2007, Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales

N Vousden, 26 October 2018