Note that the index numbers are only technical numbers which have no persistence. After a new system generation is done, all of them are invalid. To generate a persistent link, use the name.Use the URL:
http://ww-person.com/cgi-bin/l3/LANG=germ/F=Jean@II/N=de@Dreux,@de@Braine,@de@Montfort-l'Amaury@et@de@Joigny
Jean II de Dreux, de Braine, de Montfort-l'Amaury et de Joigny
alternatively: /cgi-bin/llmult/LANG=germ/P=6003240
Jean II de Dreux, de Braine, de Montfort-l'Amaury et de Joigny