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@Montagu@*@de@Couches,@Sainte-Pereuse@et@de@Marigny
Jean II de Montagu * de Couches, Sainte-Pereuse et de Marigny
alternatively: /cgi-bin/llmult/LANG=germ/P=6037958
Jean II de Montagu * de Couches, Sainte-Pereuse et de Marigny