Sabina (wife of Hadrian), reverse Vesta.
The coins are all from the Llanvaches hoard, found in 2006 not far from Caerleon and now on display there. All are Roman silver denarii (singular: denarius), produced at Rome. The hoard comprised in total 599 denarii, buried in a greyware pot around AD 160.
To view this item in 3D, click: http://labs.casgliad.sequence.co.uk/caerleon-coin-5.aspx