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=Emich@XIII./N=zu@Leiningen@u.@Dagsburg-Falkenburg-Heidesheim
Emich XIII. zu Leiningen u. Dagsburg-Falkenburg-Heidesheim
alternatively: /cgi-bin/llmult/LANG=germ/P=36000401