Richly illustrated catalog of a unique altarpiece by Rogier van der Weyden's grandson New restoration techniques are revealed Written by specialists (art historians and conservators) Written to coincide with the opening of an exhibition Crazy about Dyphna at the Saint Dymphna Church, Tallinn, Estonia, May 21 until October 31, 2021 and Geel, Belgium, Autumn 2022 Around 1505 Goossen Van der Weyden, Rogier's grandson, painted a monumental altarpiece depicting the various phases of Saint Dymphna's insane life. This Irish princess, who fled her incestuous father in the sixth century, was beheaded in the Kempen village of Geel. On account of her tragic end and uncompromising chastity, the princess was venerated from that moment on as the patron saint of the mentally ill. From the late Middle Ages, pilgrims flocked to Geel in large numbers to catch a glimpse of Saint Dymphna. They paid homage to the local celebrity in the hope that she would alleviate their mental problems. To this day, Geel is known for its unique treatment of the mentally ill, who are cared for at home by locals. Goossen Van der Weyden's altarpiece came into being at the height of Dymphna's popularity. The masterpiece was intended for the church of Tongerlo Abbey. Today this work is characterized by a remarkable iconography and an eventful history: a panel was lost and the triptych was even sawn into pieces. It ultimately came into the hands of a team of specialists from Belgium and abroad who subjected the altarpiece to a meticulous conservation over a period of three years, a colossal undertaking during which new techniques were used. This gave the conservators unprecedented insight into the mind, and workshop, of an early 16th century painter. This richly illustrated book is the result of years of research and contains essays by Till-Holger Borchert (Musea Brugge), Stephan Kemperdick (Gemäldegalerie, Staatliche Museen, Berlin), Katharina Van Cauteren (The Phoebus Foundation, Antwerp), Lucinda Timmermans (Rijksmuseum, Amsterdam), Patrick Allegaert (Dr. Guislain Museum, Ghent) and many others.