Small slab probably originally wider at the top than the bottom (the original right side — at present the top edge — is damaged). The stone bears a simple cross (type A1), incised as single vertical and horizontal lines 0.4 cm deep. These incised lines are smooth and rounded in profile. The cross stands on a base line, 12 cm (4.72 in) wide, that is pecked rather than continuously incised, and there is a short crosslet line near the top of the upper arm that is also pecked.

Cross-slabs with simple incised or pecked linear crosses are notoriously difficult to date. Recent scholarship has tended to support Nash-Williams' proposed date of seventh to ninth century for many of these monuments, while acknowledging that some are more problematic (Edwards 2007, 63–72, fig. 7.2; Redknap and Lewis 2007, 136–7, 145–6). Cross-carved stones are widespread across south and south-central Wales, acting in the earlier periods as simple grave-markers, praying stations or boundary markers (Redknap and Lewis 2007, 137). Llanveynoe St Peter 4 has been broken off at the base, and this probably indicates that it was originally set in the ground. A stone bearing a sixth-century inscription was found not far from Llanveynoe church at Olchon House (see entry below, p. 291) and it is possible that nos. 4 and 5 might have been associated with it.