Back towards Derry, the graveyard at Fahan is worth a visit. Here is St Mura’s cross, a stone slab with Celtic ornament and small projections at its side. It is thought to date from the beginning of the eighth century and is associated with an important early monastery on this site. An inscription in Greek (the only example in Ireland) translates as ‘Glory and honour to the Father and to the Son and to the Holy Spirit’. This is a formula first used at the Council of Toledo in 633.