them from Viking raids. The 'Apostles' Stone', an elaborate but badly worn cross-slab preserved in the cathedral museum, may date to this time. A well-preserved bronze 'Celtic' hand bell, formerly kept in the church of the parish of Little Dunkeld on the south bank of the River Tay opposite Dunkeld, may also survive from the early monastery: a replica is kept in the cathedral museum. The dedication of the later medieval cathedral was to St Columba. This early church was for a time the chief ecclesiastical site of eastern Scotland (a status yielded in the 10th century to St Andrews). An entry in the Annals of Ulster for 865 refers to the death of Tuathal, son of Artgus, primepscop (Old Irish 'chief bishop') of Fortriu and Abbot of Dunkeld. The monastery was raided in 903 by Danish Vikings sailing up the River Tay, but continued to flourish into the 11th century. At that time, its abbot, Crínán of Dunkeld (d. 1045), married one of the daughters of Máel Coluim mac Cináeda (1005–34) and became the ancestor of later Kings of Scots through their son Donnchad (Duncan I) (1034–40). Middle Ages The see of Dunkeld was revived by Alexander I (1107–24). Between 1183 and 1189 the newly formed diocese of Argyll was separated from that of Dunkeld, which originally extended to the west coast of Scotland. By 1300 the Bishops of Dunkeld administered a diocese comprising sixty parish churches, a number of them oddly scattered within the sees of St Andrews and Dunblane. The much-restored cathedral choir, still in use as the parish church, is unaisled and dates to the 13th and 14th centuries. The aisled nave was erected from the early 15th century. The western tower, south porch and chapter house (which houses the cathedral museum) were added between 1450 and 1475. The cathedral was stripped of its rich furnishings after the mid-16th century Reformation and its iconoclasm. The nave and porch have been roofless since the early 17th century. They and the tower in the 21st century are in the care of Historic Environment Scotland. Below the ceiling vault of the tower ground floor are remnants of pre-Reformation murals showing biblical scenes (c. 1490), one of very few such survivals in Scotland. The clearest to survive is a representation of the Judgement of Solomon. This reflects the medieval use of this space as the Bishop's Court. Within the tower