The prayer book of Mary of Guelders

Too fragile to touch, too beautiful to remain unknown. The prayer book that once belonged to Duchess Mary of Guelders is the greatest work of art from medieval Guelders. In 2015, this book will be exactly six hundred years old. It’s famous but unknown, since it cannot be examined before undergoing extensive restoration. Medievalist Johan Oosterman wants to achieve this with your help. More information: