A two-legged dragon under a peridexion or peridens tree. In medieval bestiaries, the peridexion tree was believed to grow in India. Its sweet fruit attracted doves and the tree protected the doves on the shadowed side of the tree from dragons. In the medieval allegory to Christianity, the doves were faithful Christians who were safe from the Devil as long as they remained in the Church. The devil, symbolized by the dragon, would devour Christians who left the church. The Medieval Bestiary.
To learn more about the history of dragons, see The Evil, Medieval Ancestors of Modern Dragons
13th-century English manuscript; Courtesy of the British Library Catalogue of Illuminated Manuscripts.