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=Renaud@I/N=de@Dammartin@*@de@Boulogne,@d'Aumale@et@de@Mortais
Renaud I de Dammartin * de Boulogne, d'Aumale et de Mortais
alternatively: /cgi-bin/llmult/LANG=germ/P=6004141