The Swan Diptych A diptych is a painting or carving (often an altarpiece) on two panels, hinged like a book. The two stories in The Swan Diptych are likewise hinged, sometimes obviously, sometimes more subtly. Both depict the consequences of the folly and overweening pride of those who are clothed in 'a little brief authority'. In the year 1387, King Richard II visits the thriving cathedral city of Lincoln and presents a ceremonial sword to the Mayor. There is a local legend that if the swans ever leave the pool at the foot of the steep hill where the cathedral stands, the building will fall. During the celebrations the Dean believes himself to be insulted by one of the swans and vows to avenge himself. How the Dean Angered the Swans is a fable which exposes the arrogance of man and his refusal to recognise his proper place in a world which is in his custody. The Patronal Feast is set in St Stephen's College, Cambridge, in Tudor times. During the annual feast in honour of the saint's name, members of the college are permitted to eat roast swan by an edict of Richard II called the King's Writ, which is read out as the dish is served. Before the night is over, a macabre ritual murder is discovered, the Writ has disappeared, and a kitchen boy has been abducted. Paolo Giovio, internationally renowned scholar, and friend of Erasmus, is sent for. He uncovers a dark train of events, involving men of power and high station. This is a tale of ambition and betrayal over three turbulent decades. Ian Thomson is the author of The Mouse Triptych. He was educated at Downing College, Cambridge and lives in Lincoln.