Template:Showfacts set ancestors/doc

Accessing the properties
The following will display a list of individuals that have William I in their ancestor lists:
 * }}

A template processing this array could use #explode: using the key "William I, King of England (1027-1087)" as a delimiter on the ahnentafel property value returned. This would allow the template to return the generation number and parental relationship that William I had to the subject.