Over The Threshold Duke and Duchess of Argyll arrive at Castle The traditional bannock is broken above the head of the new Duchess of Argyll as she is carried over the threshold of Inveraray Castle - historic stronghold of the chiefs of clan Campbell - by the Duke The 47 year old Duke of Argyll married the former Mrs Margaret Sweeney aged 38 in London As they arrived at the greaat Castle the couple were piped in by Donald M'Arthur of Inveraray the Duke's own piper 26th March 1951