THE Gask Ridge was the earliest fortified land frontier in the Roman Empire. It predated Hadrian's Wall by 40 years and the Antonine Wall by 60 years, and consisted of a road – lined with signal towers – that connected strategic forts. In later centuries, the area was an important centre of Christianity in medieval times. Although Inchaffray Abbey to the north of the ridge is now an ivy-covered ruin, several old chapels are still in use today. Their churchyards contain some ancient gravestones, engraved with symbols.Read