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=fran/F=Philippe@I/N=de@Plancy@*@de@Praslin@et@de@Bragelogne
Philippe I de Plancy * de Praslin et de Bragelogne
alternatively: /cgi-bin/llmult/LANG=germ/P=6044378