==Works==The works of Ludolf, who is said to have been acquainted with twenty-five languages, include "Sciagraphia historiae aethiopicae" (Jena, 1676); and the "Historia aethiopica" (Frankfort, 1681), which has been translated into English, French and Dutch, and which was supplemented by a "Commentarius" (1691) and by "Appendices" (1693-1694).